I （C.spent,度过） a happy weekend with my classmates.
At about nine o’clock we （B.started,开始） to climb the mountain.
Mary （started,开始） to learn the piano when she was five years old.
熬夜对你的身体不好
It's bed for your health （to stay up）.
我想租一间带三个卧室的房子
I want to rent a （house with） there bed-room.