Điền vào chỗ trống dạng đúng của từ.
1. Sam .....before I reached his place.
2. She no longer.....here.
3. I ..... in Mumbai for twenty years by next January.
4. I ..... my homework before I went to play.
5. I ..... him twice before he went to Amsterdam.
6. Before he became a famous inventor, Edison .....newspapers to earn a living.
7. When I was young, I ..... out every day.
8. We....for Singapore this evening.
9. If you pour oil on water, it ....
10. We .....in Mumbai for 15 years.
11. Did you.....him yesterday?
12. He might .... our offer.
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