Dưới đây là các câu được hoàn chỉnh với động từ thích hợp:

1. **Water boils** at 100 degrees Celsius. (boil)

2. They **were having** tea when the doorbell **rang**. (have/ring)

3. When he **arrived**, we **were having** dinner. (arrive/have)

4. When I **met** Brian, he **was doing** the shopping. (meet/do)

5. While George and John **were cleaning** their room, she **was doing** the ironing. (clean/do)

6. They **were playing** football when the lights in the stadium **went** out. (play/go)

7. We **haven't seen** him since he **got** married. (see/get)

8. Last month my brother **sent** me his photos. He **sends** me his photos every year. (send)

9. Nam is a careful driver, but yesterday he **drove** carelessly. (drive)

10. Do you like swimming, Ba? – I **did** when I was a child but not now. (do)

1. **Water boils** at 100 degrees Celsius. (boil)

2. They **were having** tea when the doorbell **rang**. (have/ring)

3. When he **arrived**, we **were having** dinner. (arrive/have)

4. When I **met** Brian, he **was doing** the shopping. (meet/do)

5. While George and John **were cleaning** their room, she **was doing** the ironing. (clean/do)

6. They **were playing** football when the lights in the stadium **went** out. (play/go)

7. We **haven't seen** him since he **got** married. (see/get)

8. Last month my brother **sent** me his photos. He **sends** me his photos every year. (send)

9. Nam is a careful driver, but yesterday he **drove** carelessly. (drive)

10. Do you like swimming, Ba? – I **did** when I was a child but not now. (do)