<span>1. The report should be made at the conferences next month.
2. Goods must be exported to different countries.
3. Test aircraft should be done carefully.
4. Goods need to be advertised at fairs and exhibitions.
5. Fairs and exhibitions can be held under various mottos.</span>
1. They didn't begin the perfomance until all the seats had been taken
2. By the time they returned to their native city a new cinema had been built
3. I didn't go to the party because i .had not been invited
4. I couldn''t go to my favourite cafe` as the building had been ruined
5. They took their car from the service after it had been repaired
6. She began to cry after the results of the competition had been announced
7. Columbus became famous after a new continent had been discovered
7.17-seventeen minutes past seven
7.30-half past seven
7.39-twenty-nine to eight
13.00-one o'clock 1 p.m
19.30-half past seven