It’s getting late. We must "be off" now. Which of the following can’t replace the underlined part?

A. begin 　 B. be leaving　 C. start 　 D. go

It’s very dangerous to ____________(暴露在)these viruses without any protection. (expose)

My pictures__________until next Friday.?

A.won’t develop ?

B.aren’t developed ?

C.don’t develop ?

D.won’t be developed

-- How long are you staying?

-- I don't know. ____.

A. That's OK　　　　 B. Never mind

C. It depends　　　　 D. It doesn't matter

汤姆的身体因过度劳累而跨下来，这令他的父母很不安。(break down)

　 _______________________________________________________________

World Wildlife Fund __________very much the efforts that China has made to protect endangered species from being further endangered.

　 A. enjoys B. prefers 　 C. loves D. appreciates

—The cake is delicious.

　 —Well, at least it is　　　　 the one I baked last week.

　 A. as bad as　　 B. no worse than　　 C. no better than　　 D. not better than

The major world powers are afraid of ______in the weapon race．

　　 A．falling behind　　　　　 B．falling down

　　 C. being left alone　　　　　 D．being left behind

The new owners have tried to give the restaurant a more family-friendly a_________.