1 Several lessons have been missed.
2 A film about our teacher is going to be made.
3 Students' project will have been finished by next month.
4 The business letter must be answered at once.
5 Who was this thing designed by?
6 The latest events are being talked about.
7 Nothing can be done at all.
8 Arrangements will be made by us as soon as he comes.
9 Who were the tickets booked by?
Объяснение: