I have to go to bed ____ 9 o’clock.[ ]

I will buy you a new bike if you learn how to swim this summer. —Is that a ________? I’m sure I’ll get the bike.

You had better ________ some time every day for sports so that you can keep yourself energetic.

How many members does your club have?— There are members in my club.

I have historythe afternoon of Monday.[ ]