Ответ:

1. B:They don’t have to wear formal clothes, but they have to look tidy.

2.A:Do British taxi drivers have to work night shifts?

B:Yes, we sometimes have to work at night, but we don't have to work every night.

3.A:Do I have to cook meals?

B:No, you don't have to do the cooking, but you have to help the children to eat.

4.A:Does your daughter have to travel abroad in her job?

B:No, she doesn't have to travel abroad, but she has to speak foreign languages.

Объяснение: