1. There            (be) fewer cars in the future.
2. She wants to be a          (science) when she grows up.
3. We can see _______(hundred) of birds flying to the south.
4. There is ________(little) pollution in our city than last year.
5. I can do my homework by ________(I).
6. He lives in a tall ________(build) and goes up and down by elevator.
7. It took me an hour ________(finish) my homework.
8. In two hours Miss Yang ________(fly) to Paris.
9. Betty ________(write) to her parents the day before yesterday.
10. The _______(factory) produce(生产)many different kinds of toys for
children.