b. Decide if the sentences express necessity or possibility, then fill in the blanks.
(Quyết định xem các câu thể hiện sự cần thiết hoặc khả năng xảy ra, sau đó điền vào chỗ trống.)
1. Members' cards must be shown(show) at the front desk when entering the gym.
2. Swimming caps _________ (wear) at all times in the pool by all members.
3. The pool _________ (book) for parties. Members should book at least one week before the event.
4. Members can use their own balls and rackets on the tennis courts. Also, balls and rackets _________ (rent) at the front desk.
5. Members must not bring their bags into the exercise area. Bags _________ (keep) in the lockers at all times.
6. Rented equipment _________ (return) to the front desk before the Center closes. Members have to pay for rented equipment that is not returned in time.
2: must be worn
3: must be booked
4: can be rent
5: must be kept
6: must be returned
