1、Blank-filling 21: Nowadays，millions_16_lonely singles are now going online instead._17_World Wide Web is quickly becoming the worlds most popular matchmaker (媒人)Singles are flocking(涌向) to the Internet_18_because their busy lifestyles leave them little time to look for a significant other. Using dat
2、ing sites (约会网址) is quick and convenient. Many singles say the regular dating scene_19_(just lead) them from one bad experience to_20_and are ready to try something else. Dating sites also make_21_ easy to avoid someone_22_you are not interested in. In the real world，_23_，ignoring someone you dont l
3、ike can be difficult.Despite all the advantages, online dating also presents its own set of problems. People arent always those who they declare to be in their online_24_(describe)Safety is another concern. You are just_25_ (like) to find a criminal online as you are Mr. Or Miss Right.Keys to 21:16.
4、 for17. what18. to explain19. replied20. while/because/as21. where/so22. or23. Before24. truly25. speechless16of17The18mainly19has just led20another21it22who/whom23however24description25likelyBlank-filling 22:The Internet is an amazing information resource. Students, teachers, and researchers use it
5、 as_16_investigative tool. Journalists use it to find information for stories. Doctors use it to learn more about unfamiliar diseases and the_17_(late)medical development. Ordinary people use it for shopping, banking，billpaying, and communicating with family and friends.People all over the world use
6、 it to connect with individuals from_18_countries and cultures. However，_19_there are many positive developments_20_(associate)with the Internet, there are also certain fears and concerns._21_concern relates to a lack of control over_22_appears on the Internet. With television and radio there are ed
7、itors to check the accuracy or appropriateness of the content of programs, and with television there are_23_(restrict) on what kinds of programs can_24_(broadcast) and at what times of the day. With the Internet, parents cannot check a published guide to determine what is suitable_25_their children
8、to see.Blank-filling 23:The Internet is an amazing information resource. Students, teachers, and researchers use it as_16_investigative tool. Journalists use it to find information for stories. Doctors use it to learn more about unfamiliar diseases and the_17_(late)medical development. Ordinary peop
9、le use it for shopping, banking，billpaying, and communicating with family and friends.People all over the world use it to connect with individuals from_18_countries and cultures. However，_19_there are many positive developments_20_(associate)with the Internet, there are also certain fears and concer
10、ns._21_concern relates to a lack of control over_22_appears on the Internet. With television and radio there are editors to check the accuracy or appropriateness of the content of programs, and with television there are_23_(restrict) on what kinds of programs can_24_(broadcast) and at what times of
11、the day. With the Internet, parents cannot check a published guide to determine what is suitable_25_their children to see.Keys to 22-23:16. an17. latest18. other/different19. while20. associated21. One22. what23. restrictions24. be broadcast(ed)25. for16. an17. latest18. other/different19. while20.
12、associated21. One22. what23. restrictions24. be broadcast(ed)25. forBlank-filling 24:I remember my first Christmas adventure with Grandma. I remember tearing across town_16_my bike to visit her on the day my big sister dropped the bomb: “There is no Santa Clause. ”she laughed. “Even dummies(傻瓜)know
13、that！” I_17_(flee) to Grandma_18_I knew she would be straight with me.She always told the truth.“No Santa Clause？” she said.“Ridiculous! Dont believe_19_. Put on your coat, and lets go.”“Go where, Grandma？” I asked.As we walked through the doors of the general store Grandma handed me ten dollars and
14、 said, “Buy something for someone_20_needs it. Ill wait for you in the car.”I was only eight years old. Never had I shopped for anything all by myself.For a few moments I just stood there，_21_(wonder) what to buy, and who_22_(buy) it for. I thought of everybody I knew. Then I thought about Bobbie De
15、cker.He was my classmate with bad breath and_23_(mess) hair，and he sat right behind me.He didnt have a coat. I knew that because he never went out to play games during the winter. I fingered_24_bill with growing_25_(excite). I would buy Bobbie a coat. Blank-filling 25:If the population of the Earth
16、keeps on_16_(increase) at its present rate，there will_17_(event) not be enough resources left to support life on the planet. By the middle of the 21st century，if present trends continue，we_18_(use) up all the oil that drive our cars, for example. Even if scientists develop new ways of feeding the hu
17、man race, the crowded conditions on Earth will make it_19_(necessity) for us to look for somewhere else. But_20_of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem，_21_， has recently been suggested by an American scientist, Profess
18、or Carl Sagan. Sagarn believes that_22_the Earths resources are completely_23_(exhaust) ，it will be possible to change the atmosphere of Venus and_24_create a new world almost as large as Earth itself. Something is difficult. Venus is much hotter than the Earth._25_， there is only a tiny amount of water there.Keys to 24-25:16. on17. fled18. because/as19. it/that20. who/that21. wondering22. to buy23. messy24. the25. excitement16increasing17eventually18will have used19necessary20none21however22before23exhausted24so/therefore25Besides