Key to exercises

Exercise 1, page 35 (PET Practice Tests)

There are often more possibilities, some of them are written in parentheses ().

It has two separate swimming pools.
Only adults can use (are allowed to use/are permitted to use/can go in) the main pool.
You can go in free (can go in without paying/don’t have to pay/are not charged) if you are under 18.
You can hire sports equipment.
Swimming keeps you healthy (fit).