Ответ:

ex 1.

1)b

2)a

3)c

4)c

5)c

6)a

7)b

8)a,b

9)c

10)a

ex 2.

1)should

2)must

3)could

4)can

5)may

6)have to

7)had to

8)mustn’t

ex 3.

1)the pupils aren’t writing a dictation.

are the pupils writing a dictation?

2)the pupils haven’t written a dictation.

have the pupils written a dictation?

3)the pupils usually don’t write a dictation.

do usually pupils write a dictation?

Объяснение: