用动词的正确时态填空。
1. He____ (study) at this school ten years ago.
2. They ____ (watch) TV at home since 8:00.
3. It's 9:00 now. All the students ____(have) an English class in the classroom.
4.— ____you ____(see) any movie recently?
—Yes, I ____(see) Harry PotterⅢ yesterday.
5. Our E nglish teacher ____(teach) English at this school for about 20 years.
6. Mary's father likes ____(climb) mountains, so climbing mountains is his hobby.
7. As drivers, they must ____(obey) traffic rules.
8. She ____(scream) when she saw a long snake.
9. We didn't go home until we finished ____(clean) the classroom.
10. Do you know how ____ (make) a vegetable salad?