_____ such heavy pollution already,  it may now be too late to clean up the river.

A．Having suffered

B．Suffering

C．To suffer

D．Suffered

Visitors ______ not to touch the exhibits.

A．will request

B．request

C．are requesting

D．are requested

—Good morning, Grand Hotel.

—Hello, I’d like to book a room for the nights of the 18^th and 19^th.

—_____

A．What can I do for you?

B．Just a minute, please.

C．What’s the matter?

D．At your service.

The research is so designed that once ________ nothing can be done to change it.

A．begins

B．having begun

C．beginnings

D．begun

Excuse me for breaking in, ______ I have some news for you.

A．so

B．and

C．but

D．yet

—I think you should phone Jenny and say sorry to her.

— ______. It was her fault.

A．No way

B．Not possible

C．No chance

D．Not at all

News reports say peace talks between the two countries_____ with no agreement reached．

A．have broken down

B．have broken out

C．have broken in

D．have broken up

Why don’t you put the meat in the fridge? It will _______ fresh for several days.

A．be stayed

B．stay

C．be staying

D．have stayed

—Sorry, Joe. I didn’t mean to

—Don’t call me “Joe”. I'm Mr. Parker to you, and _____ you forget it!

A．do

B．didn’t

C．did

D．don’t

He didn't work hard at English before the exam, or he ________.

A. must be able to do it better　　　　B. will be able to do it better

C. would have done it better　　　　 D. can do it better