---Are you sure you have to do it? It’s been very late.-----I don’t know ________I can do it if not now.A .where B. why C. when
—Could you tell me ________? —By searching the Internet.
I have made ________ new friends here that I really enjoy my school life.
—Do you know ________ Simon is? —I met him in the school library just now. He may be still there.
It’s too cold outside. I prefer staying at home ________ on such a day.
It is raining ________ outside. You’d better not leave now.