用所给单词的适当形式填空。
1. I think she__________(be) an excellent writer in the future.
2. What_________ you _________( do) at 9:00 a. m. yesterday?
3. While it__________(snow) heavily, she went out.
4. The plane usually _________ (leave) the airport at seven o'clock in the morning.
5. Look! The boys _________( play) football over there.
6. When I was walking on the road last night, someone________(follow) me.
7. He was __________(surprise) at the ____(surprise) thing,
8. I________( see) a big black dog when_________(come) in.
9. Someone___________( shout) at the poor old man at eight yesterday evening.
10. What ___________( happen) while Linda was on the telephone?