Question

means:
2. Look at the highlighted verbs in exercise Ib.
1) it is very important/necessary to do something? (If you don't do
it, you will have a serious problem.) have to
2) it is not necessary to do something? (You can do it if you want)
3) it is OK to do something? (If you do it, there is no any problem)
4) it is not OK to do something? (If you do it, you will have a
serious problem)
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Answer 1

Ответ:

1)necessary

2)have to

3)if you want