用括号中所给的适当形式填空 1. During on second, 3______________(baby) were born in the world. 2. At the ______________ (begin) of the twentieth century, the world’s population was about 1,7million. 3. Do you know what the most ________________ (expensive) car in the world is? 4. They never knew what _________________ (happen) to the world in a hundred years. 5. As he was busy ______________(search) the Internet, he became interested in how different counties were. 6. Mr. Wang _______________ (left) Hong Kong more than 50 years last week he flew back, and was surprised __________ (see) that Hong Kong __________(change) a lot. He said he _________( spend) the rest day of his wife here. 7. In America you can buy a _____________(use) car for as ___________(little) as 3000 dollars. 8. I ____________(do) my homework when my mother came back from factory. 9. Could you tell me when the English evening party __________(begin). 10. There ____________(be) a basketball match the day before tomorrow. 11. Some leaves ______________ (turn) red in autumn. 12. I’m sure we _____________(meet) somewhere before. 13. The moon is quite near to use in space, and it ______________ (visit) by man already. 14. I often hear mike _____________(read) Chinese in the evening. 15. Father asked me___________ (not carry) about my birthday party. 1 6 . It is ___________ ( hot ) today than it was yesterday . 17 . We’ll go to Beijing if it _____________ ( not rain ) tomorrow . 18 . I __________ ( live ) here since I was born . 19 . Mary wants _________ (be )a doctor after she grows up .