【海南省2015年中考英语试题】选用方框内所给词的适当形式填空。每个词只能用一次。

My brother is very busy. He often ________    day and night.
—What do you think of this math problem?
—It’s as     as anything.
“May I come in?” he asked       .
Mrs. Black doesn’t allow her son        computer games on school nights.
We should be friendly to      . They’re also members of our world.