Try _____ the puzzle in some other way, son.

A. to solve　 B. solve C. solving D. solved

- Director Wang, a man is waiting to see you outside, _______ he come in?

-- In a moment. I' m busy right now.

A. Can　　　　 B. Shall　　　　　　　 　 C. May　　　　　 D. Would

Was it _____the conference of APEC that made Shanghai the focus of the world then?

A. holding　　　　　 B. to hold　　　　　 C. held　　　　　　 D. having held

Children like to ask “why” in order to satisfy their c________.

---Could you meet me at the airport?
---I'd like to, but I ____ to Hainan when you return.

A. will have flown    　 B. was flying 　　　 C. will fly        D. have flown

I recommended that the student ___ his composition as soon as possible.
A. finishing writing 　　 B. should finish the writing

C. finish writing 　　 D. finished writing

The director had her assistant ________ some hot dogs for the meeting.

A.picked up　　 B.picks up　　 C.pick up　　 D.picking up

Such animals as dinosaurs died out because they couldn’t ___ to the sudden change of the climate.

A. suit　　　 B. keep　　　 C. adapt　　　 D. switch