If you ______ early tomorrow morning, you would be there by noon.（ ）

A. have started　　 B. were start　　 C. were to start　 D. had started

Early this year cruel snowstorms hit southern China , ______ great transportation problems in some areas .

　 A. causing　　　　　 B. caused　　　　　

C. to cause　　　　 D. having caused

Before liberation, when floods, earthquakes, fires and many other disasters struck, many people were ______ to leaving their hometowns.

A. made　 B. intended　 C. reduced　 D. forced

The writer and professor ______to ______abroad for two years. But no one knows which country he studied in.

　 A. are said; be studying　　　　　　　　　 B. is said; have studied

　 C. are said; to study　　　　　　　　　　 D. is said; have been studying