求证：

从下面方框中选出与下列各句中画线部分意思相同或相近，并能替换画线部分的选项。

My mother usually goes to work at ____ about 7:30 in the morning,
John is a clever boy. He ____ does well in all the subjects,
Dave's father was ill two days ago, so he had to ____ take care of him at home.
Last night, Tom was not ____ in. He went to a movie with his friends.

— Were you at home _________?

— No, I was at school.