—I’d like to call you at 10 o’clock next Friday morning if it is convenient.
—I’m afraid I _______ an important meeting.

A．will have attended

B．will be attending

C．will attend

D．would attend

About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.

A．is; doesn’t

B．are; don’t

C．are; doesn’t

D．is; don’t

—May I see your ticket, please? I think you ________ in my seat.
—Oh, you’re right. My seat is upstairs. I’m terribly sorry.

A．are sitting

B．sit

C．sat

D．have sat

Miss Li ________ as a biology teacher for fifteen years in our school, and now she is Party secretary of our city.

A．works

B．worked

C．had worked

D．has worked

It ________ me that I could buy the admission ticket of the exhibition at the discount of 50% with my student card, ________ made me extremely excited.

A．happened to; that	B．occurred to; it
C．happened to; which	D．occurred to; which

—You must apologize to Rebecca for being so rude, Sam.
—Why ________ I say sorry? It’s she ________ said insulting words first.

A．should; who

B．must; whom

C．can; that

D．will; who

When and where he came here _______ yet.

A．isn’t known

B．aren’t known

C．has not known

D．have not been known

We hope that you can buy this material because it_____ well.

A．is washed

B．is washing

C．will be washed

D．washes

Jack_____his leg. Otherwise, he would have won the race.

A．had broken

B．broke

C．has broken

D．would break

The teacher reported to the headmaster how the class meeting ________ the  day before.

A．had been organized

B．was being organizing

C．has been organized

D．was organized