He will answer your questions ______ you ask him.

单项选择题—How much did the new coat（）your sister —She（）350 yuan for it.

A. cost paid
B. spend cost
C. pay cost
D. take paid

单项选择题The river is（）

A. four metres wide
B. four metres' wide
C. four metre wide
D. four metre in width

单项选择题Mother thought ______ a clever boy.

单项选择题Mr. Black is the professor（）I have the greatest respect.

A. to whom
B. for whom
C. whom
D. who

单项选择题—She was late for the party. —That's（）she had forgotten the exact time.

A. why
B. how
C. because
D. whethe