Had I known that air conditioners cause so much pollution , I _______ one.

A．would never have bought                    B．would haven’t bought

C．must never have bought               D．must haven’t bought

—I cannot thank you enough for the present you sent me.

— _______ .

A．No, thanks                                             B．With pleasure  

C．My pleasure                                           D．Please don't say so

Among the most important questions people make ____ is “how to keep the present economic growth without causing damage to the environment?”

A．answer                                                 B．being answered  

C．answered                                              D．answering

If people had left things ______they were, there would be no damage to the animal and plant life there now .

A．when         B．since              C．where             D．as

It seems that the Chinese parents don't care what a hard life they themselves live, but are determined that their sons and daughters receive _______.

A．the possible best education                     B．the best possible education

C．the education best possible                     D．the education possible best

______earliest English poetry was written in _______kind of English that is now difficult to

understand．                                                                    A．The ; the         B．The ; a       C．The ; /    D．A; a

______ nice and delicious, the roast ducks in this shop are always sold out soon.

A．Tasting              B．Tasted         C．Being tasted     D．To taste

— Why _____ you leave right now? Don't you know it's raining heavily outside?

—1 know , but my parents are expecting me.

A．should       B．must          C．will       D．won't