Đáp án:
1. "Does Tom own that car?" - "No, I think his brother owns it now." (own).
2. Fish have existed on the earth for ages (exist).
3. How many times have you seen him since he wwent to Hanoi? (see).
4. He wrote to her a month ago, but i'm sure he has written since then (write).
5. I have searched everywhere for the pen I lost yesterday (search/lost).
6. I have waited here for three hours (wait).
7. I am wearing sunglasses today because the sun is very strong (wear).
8. Be careful! Jack is painting the door. It is wet ( paint).
9. My sister has looked for you since yesterday (look).
10. I am attending Texas State University now (attend).
11. I am in the room right now (be).