问题描述：
下面四个英语句子有两个各有一处错误,请帮我找出来并改正.
Rooms will be cleared in the late morning.
Visitors will allowed to stay in the building after 9pm.
Doctors will be waited 24 hours a day.
All competitors will be expected to behave politely to each other.
Rooms will be cleared in the late morning.
Visitors will allowed to stay in the building after 9pm.
Doctors will be waited 24 hours a day.
All competitors will be expected to behave politely to each other.
问题解答：
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