The water was so cold that the children couldn't swim in it.

A. Did the manager have to be met at the airport?

B. Does the manager have to be met at the airport?

C. Is the manager had to be met at the airport?

D. Does the manager have to meet at the airport?

A. He wore glasses and a false beard lest anybody could recognize him. 

B. He wore glasses and a false beard, and so nobody could recognize him.

C. So as not to meet anyone who recognize him, he wore glasses and a false beard.

D. He could avoid being recognized because he wore glasses and a false beard.

A. Having defeated the former champion in the inter-school table tennis, Nam did not hold the title of champion.

B. Although Nam defeated the former champion in three sets, he did not win the title of inter-school table tennis champion.

C. Having defeated the former champion in three sets, Nam won the inter-school table tennis championship.

D. Being defeated by the former champion, Nam lost the chance to play the final game of inter-school table tennis champion.

A. That he is vey lazy makes his parents worried.

B. The fact he is very lazy  makes his parents worried.

C. Being very lazy  makes his parents worried.

D. He is very lazy which makes his parents worried

A. Unless we had forgotten to take the map with us, we would have got lost

B. If we had remembered to take a map with us, we wouldn't have got lost.

C. Had we not forgotten to take the map with us, we would have got lost.

D. If we had remembered to take a map with us, we would have got lost.

A. If Jack’s watch hadn’t been ten minutes slow, he wouldn’t be late for his interview

B. If Jack’s watch hadn’t been ten minutes slow, he wouldn’t have been late for his interview

C. If Jack hadn’t been late for his interview, his watch wouldn’t have been ten minutes slow.

D. If Jack’s watch weren’t ten minutes slow, he wouldn’t be late for his interview.