Điền đúng dạng từ trong ngoặc

Điền đúng dạng từ trong ngoặc:
1. I (watch) a film on TV when the electricity (go) out
2. While the doctor (exam) Mr TU, his son (wait) outside this morning
3. When the boss (walk) into the office, his secretary (typ), and the accountant (talk) on the phone
4. The guard (listen) to his iPod, so he (not hear) the fire alarm
5.The titanis (cross) the Atlanic when it (struck) an iceberg
6 We were late because we had some car problems. By the time we (get) to the train station, Helen (wait) for us for mre than 2 hours
7. Mike (wait) to sit down because he (stand) all day at work
8. The motorcycle (belong) to Mike for years before Tina (bought) it last week
9. No matter what (happen) next, I (support) you
10. Wait a minute. I (carry) this bex for you