19. We won”t go sightseeing if _______ tomorrow.

A. it rains B. it will rain C. it would rain D. it rained

18. ______ the help of the Internet, we can learn what other people around the world are doing.

A. By B. Through C. With D. For

17. Believe it or not, more than half of our body weight _______ water.

A. comes across B. comes from C. comes by D. comes to

16. －By the way, do you know the National Spelling Bee?

－No, I never heard of it. Tell me _______, please.

A. what is it B. what it is C. it is what D. is it what

15. Please pay your attention to your spelling. You”ve dropped _______ “d”in the word Wednesday.

A. an B. the C. a D. 不填

14. －Hello! I haven”t seen you for years.

－Oh, John. _______?

A. How are you B. How do you do

C. How about you D. What are you

13. The world is becoming smaller and smaller because the Internet brings us _______.

A. the close B. closer C. the closer D. close

12. There is a lot of traffic in the city, ______ look both ways before crossing the street.

A. so B. and C. but D. for

从A、B、C、D四个选项中，选出可以填入空白处的最佳答案。

11. Tom and Linda are _________ from Australia.

A. students B. girls C. boys D. sisters