1. Goes/works
2. Are doing
3. Fly
4. Is knocking
5. Is sitting_ sits
6. Hears
7. Heard_ was
8. Was walking
9. Were saying
10. Has been working_left
11.haven’t met
12.has risen
13. Has changed
14.gave
15.waited
16.will be relax
17. Have ever met
18. Would have visited
19.has improved
20. Had left
1. The computer was bought by my father last weekend
2. Hundred of beautiful houses are built everyday
3.a house is going to be built opposite my school
4.lights must be turned off before___
5.we are made to laugh a lot____
6. I have been taken to the palace many times
7.has your essay been finished?
8.when guitar is played by you?
9. He will be contacted as soon as possible
10.a lot of old friends were invited to her party