用单词的适当形式填空。
1. It was difficult ________(build) the railroad for us.
2. What's ________ (he) name ?
3. Are those ________ (girl) your ________ (classmate) ?
4. He ________ (wave) to me and smiled .
5. The British ________ (bridge) are very nice .
6. We ________ (not,have) chicken but fish for lunch yesterday.
7. —How long ________ it ________ (take) you to finish your homework last night?
—Tow hours.
8. Yang Liwei is the ________ (one) astronaut of China.
9. These ________ (hero) are from Africa.
10. They ________ (build) the railroad five years ago.