1.1.Before i (watch)........,I (do). my homework .

2. He (open ).....the door, (enter).......the room ,and (break).....something.

3.The earthquake (happen).......... while we(sleep).....

4.He (write ) ......the textbook ,when we(have) a headache

5.We (return)......from New York by train.

6.If you visit me tomomorrow ,I (give)..you a small present .

7.They (look).. at the pictures when I (break)..... the glass.

8.We (study)... when she (call)...... her children .

9.He told me he (not/eat)...... such kind of food before .

10.Tomorrow i (leave)........ for home.

11.I think he (come )...... tomorrow .

12.Who is this lady ? She (move)  ...into no 4 last month .

13.I (wait)....... for ages when finally the bus arrived .

14.they (prepare)....the Christmas dinner today.

15.She says that she (live). in the coutry when she (be) ...... a child.