Can I pay the bill by check? — Sorry, sir. But it is the management rules of our hotel that payment ______ be made in cash.

The outbreak of this incident has given us much for thought, forcing us to ______ seriously on the past and the future.[ ]

下列各句中，没有语病的一句是（ ）

He hasn’tgot any hobbies—_______ you call watching TV a hobby.

Having checked the doors were closed and ______ all the lights were off, the boy opened the door to his bedroom