Відповіді: Стр.50 (4)

4. Complete the caption under each sign with a suitable modal verb.

1. If you’re under 15, you don’t have to pay the full price.

2. You shouldn’t enter here if you aren’t a passenger.

3. You need to get to the gate within the next ten minutes.

4. You have to give your books back to the library before the end of term.