I. Give the correct form of the verbs
1. I ( not hear ) .............. from him since he ( disappear ) ............. two years ago
2. After the guests ( leave) ............... , she (go) .................. back into the living room and (turn ) ........ off the light 
3. By the time you finished cooking they ( do ) ............ their homework 
4. This time yesterday they( sit) ............. in the train on their way to Paris 
5. I came late to class .When I ( enter) ............. the teacher (write) .......... something on the blackboard 
6. She (get ) ............. into her shoes , (put) ............ on her coat and (go) .............. to the door 
7. David (be) ........... born after his father ( die) ..............
8. When I (be) ........... a child , I (want ) ........... to be a doctor 
9. At 4 p.m yesterday ? Well ,I (work) ................. in my office at that time 
10. The audience (listen )............... to everything he said last night 
11. Yesterday thievesb( break ) ............. into the house and ( steal ) ........... a lot of fur coats while the guests   (dance) .....................
12. He ( do) ............ his homework before he went to cinema  
13. What you( do) ................ after you (go) .............. home yestreday ?
14. Tom (not come ) ............. her tomrrow 
15. John (watch )................ TV at 8 last evening 
16. Dick ( start) ..................... school before he ( be ) seven 
17. What you (do ) ................ when I (ring) .......... you last night ? 
18. John ( drive) .................... that car ever since (know) .......... him 
19. Columbus ( discover) ............... America more than 400 years ago
20. When the teacher came in, the pupils (play) ............. games