1.     The sheep (graze)………………………. field when they (be)………………. scared the noise.

2. The boys (swim) …………….. while the girls (sunbathe) ………………..

3. While  she (practice)………………. piano late last night, she (hear)…………. a strange noise.

4. I was running  to catch the bus when I (see)……………………..…….. An.

5. If she had more money, she (treat) …………….herself to a decent meal.

6. My brother (leave) …………. home 10 years ago. I (never meet) ………….. him since then.

7. While everyone (sleep)……………………..,  my brother (watch)…………………………….TV.

8. My mother (come) ……………..….. in, looked around and told me to tidy up my room.

9. My close friend adores (take) .......................... photos. He has got an expensive camera.

10. I was dreaming about a long vacation, when the alarm clock (go)……………………… off.

11.We ( have)………………… breakfast,  when the mailman arrived.

12. When you (meet)…………………. Nga last night, what she  (wear)………………………..?

13. Some people (chat)……………. while others (play)…………….games at the party last night.

14. What An and Nam (do) ……………………….. while their parents were working on the farm?

15.  If you were a billionaire, what (you do)…………………………..…………..?

16. My mother detests (travel) ....................... by bus because she can be carsick.

17.  We (do ) …………………… all the housework. The flat is really clean now.

18.  What  you  (do)……………..…. when the earthquake  (happen)…………………. last night?

19.  My brother  (watch)………………………..… football at 3.pm yesterday afternoon.