So long as we study with a strong will，we can answer the question__________hard it is.

Your grandparents were very great. —Yes. They supported my father’s schooling ______ they were very poor.

Mary and Jack will marry next week.—-____________ They were strangers to each other only a month ago.

Tom doesn’t seem so enthusiastic as he was two years ago. — Yes. He’s really reached a point in his career ______ he has to decide what to do next.

A heavy sandstorm is going to envelop our city. It is unwise to have your car .