_______________________ (不要让水白流) while you brush your teeth.

—Do you happen to know the professor________in Lily’s speech?

—Yes，I was introduced to him at a conference last year.

A．referring to 　　　　　　　　 B．to refer to

C．having referred to 　　　　　 D．referred to

—Do you know what Jack does all day?

—He spends at least as much time watching TV as he ________.

A. studies　　　　 　 B. does studying　 C. is studying　 　　　 D. does study

She told us __________ story that we all forgot about the time.

A. so an interesting　　 B. such an interesting

C. a so interesting　　 D. a such interesting

The woman was _______ by the business man's offer of marriage and stupidly gave him most of her money.
A. taken on   　　　 B. taken in   　　　 C. taken off   　　　D. taken out

The College Entrance Examination       near, so you should be prepared for it.

A. is drawing       B. draws　　 C. drew             D. has drawn

When leaving the airport，they 　　　 （挥手）again and again to us.?

The meeting will be taken place next Monday.

After _______ seemed half an hour, the teacher gave us the correct answer.

A. what　　 B. that　　 C. which　　　 D. it

I will always remember those days ______ I spent with him sailing on the sea.
A. on that     B.  on which     C.  when            D. which