Ответ:

1.ought to

2.don't have to

3.mustn't

4.could

5. shall

6.may

7.can

8.should

1.b

2.b

3.c

4.a

5.d

1.to relax

2.are using

3.c

4.are chosing

5c

6c

7.d

8.d

9.c

10.c