Isn't it very kind __________ your parents to do that for us? A. for B to C. about D. of
—What do you think has caused his heart attack? —It is ______.
—Do you have any idea why the engineer resigned? —No. In fact, everyone is ____about it.
It’s required that the students______ mobile phones in their school, so seldom ______ them using one.
“It isn’t the first time I ________ at home,” he said frankly.
The problem should be dealt with by the government ________ ordinary people.