1. is; it
2. were
3. isn`t
4. on
5. for
Task 4.
1. Their new disk is not being sold quickly. Is their new disk being sold quickly? Is their new disk not being sold quickly?
2. The award was not given to an unknown singer. Was the award given to an unknown singer? Whether the award was not given to an unknown singer? Who the award was given to ?
3. The problem had not been discussed by 5 o`clock yesterday. Had the problem not been discussed by 5 o`clock yesterday? What time had the problem been discussed by ?