1. When the children ____, it suddenly began to rain.

A. were playing                 B. played                        C. have been playing

2. Your hair looks terrific! ____ you ____ a haircut?

A. Had - got                         B. Have - just got                 C. When - got

3. I ____ to Da Nang twice, but I still get a lot excited whenever visiting the city.

A. went                         B. have gone                        C. have been

4. While my younger sister was studying in her room, someone ____ our house.

A. was breaking into                 B. broke into                        C. break into

5. My grandparents are not used ____technological devices.

A. to using                         B. for using                        C. to use

6. This is the second time I ____ a car accident.

A. witness                         B. witnessed                        C. have witnessed

7. While the guests ____ the party, the servants ____ more foodsand drinks.

A. were enjoying - prepared         B. enjoyed – were preparing        C. were enjoying - were preparing

8. X-rays are a modern tool that doctors use ____ malign tumors.

A. for treat                        B. for treating                         C. to treating

9. ____ your mobile phone and ____ electricity, you can get a solar charger.

A. To recharge – saving        B. For recharging - save         C. To recharge - save

10. Hi, Anna. Are you going to play badminton now? - Sorry, I ____ my homework yet.

A. don't finish                         B. haven't finished                 C. didn't finish