He started studying physics five years ago.

A. The heavy snow made the roads slippery.

B. It snowed too heavily to make the roads slippery.

C. The heavy snow prevented the roads from being slippery.

D. Thanks to the slip of the roads,it snowed heavily.

A. He asked me didn’t you come to class the day before.

B. He asked me why I hadn’t come to class yesterday.

C. He asked me why I didn’t come to class the day before.

D. He asked me why I hadn’t come to class the day before.

A. His illness was very serious that he couldn’t come to the conference.

B. Although he was ill, he came to the conference.

C. He couldn’t come to the conference, so he became seriously ill.

D. Because of his serious illness, he couldn’t come to the conference.

A. Jane said to Tom to wait a second while she got dressed.

B. Jane asked Tom to get her dressed for a while waiting.

C. Jane asked Tom to wait a second while she got dressed.

D. Jane said to Tom he should wait a second while she got dressed.