—How long are you staying? --I don’t know. _____A. That’s OK. B Never mind. C. It all depends. D. It doesn’t matter.
When ______questions in class,one should answer them as clearly as possible.
After the bell rings,which indicates the ending of the exam,you_____stay where you are until all your papers are collected.
—You were not listening;what troubled you? —I my coming math exam.
I am amazed at someone so rich _____ difficulty in paying what he owes you.
It doesn’t matter how much loss we have suffered; just avoid _____ the mistake again.