1. The train is to arrive in five minutes. We must hurry up.
2. If he doesn't meet you at the station, you will take a taxi.
3. Из предложенного ничего не подходит. Можно так: They had to be here an hour ago.
4. I'll have to go to the library after classes because I must make a report tomorrow.
5. It must be a very interesting novel, I know the author.
6. I don't think you will wait long.
7. They were to marry early in June, so they had to stay in Moscow.
8. Usually she must clean her shoes after working in the garden.
9. The lecture will begin in a minute.
10. You'll be tired, you must have a little rest.
11. I must answer a lot of questions at the examination.
12. We'll leave on Monday.