I ……tennis last Saturday (play).
He……two minutes ago (left).
My…..brother in London in 1998 (work).
We…..at the seaside 2 years ago (rest).
Mary…..of her coat (take).
He…..up and …..across the room(stand,walk).
They…..at school yesterday (be).
The girl…..somebody in the window (notice).
The teacher….the classroom (enter)
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It`s no use trying to call on the phone. The line is always busy.
There is no point in talking to my supervisor. He never listens to what I am saying.
 For what it's worth, I think you can't trust that man. And my son says, for what it's worth, that he won'tdo that again.
Dont let people upset you, because it s not worth it.
Chloe has difficulty in doing her maths homework on her own.
This project was a waste of money.
The waste of time could prove fatal.
He wasted his chances at college and did not study.
I'm going to spend the day with my family.
The phone line is busy.

1)The teacher will have to explain this difficulty again. - учитель должен объяснить эту трудность опять.
модальный глагол will  И have to 
Эквивалент should

2)You are to write you name at the top of the paper.
Тут опечатка 
ПРАВИЛЬНО ТАК:
2)You are to write your name at the top of the paper. - 
Вы должны написать ваше имя в верхней части бумаги
Модальный глагол are to
эквивалент must (you must write your name at the top of the paper)
3)He must leave early in the morning. - он должен уйти рано утром
модальный глагол must 
эквивалент iS TO (he is to leave early in the morning)
4)You should take a taxi if you don’t want to be late for the concert.
Вам следует взять такси если не хотите опоздать на концерт.
мод. глагол should - следует
его эквивалент have to
и мод. глагол to be