In much of the animal world, night is the time________ for sleep—pure and simple.

A．set aside B．set down

C．set off D．set up

Traditionally, college students hold a graduation ceremony to encourage themselves before they ________ on their life journey.

A．give up B．settle down

C．get through D．set off

My uncle hasn’t been able to quit smoking, but at least he has.

A. cut out B. cut down

C. cut up D. cut off

I ________ half of the English novel, and I’ll try to finish it at the weekend.

A. read B. have read

C. am reading D. will read

Dashan, who_________crosstalk, the Chinese comedic tradition, for decades, wants to mix it up with the Western stand-up tradition.

A. will be learning B. is learning

C. had been learning D. has been learning

When walking down the street, I came across David, when I _____ for years.

A. didn’t see B. haven’t seen

C. hadn’t seen D. wouldn’t see

in the last few years,China ___ great achievements in environmental protection.

A.has made B.had made

C.was making D.is making

—Did you have difficulty finding Ann'house?

—Not really.She___us clear directions and we were able to find it.easily?

A.was to give B.had given

C.was giving D.would give

—Is Peter coming?

—No, he____ his mind after a phone call at the last minute.

A. changes B. changed

C. was changing D. had changed

In my hometown, there is always a harvest supper for the farmers after all the wheat____ cut.

A. will have been B. will be

C. was D. has been