24、— Look! You've made the same mistake again!

— Oh, not again! _______ such a mistake.

A．I will always make                                 B．I'm always making

C．I've always made                            D．I always made

23、Our flight was ______by the thick fog. So we didn't attend the meeting on time.

A．broken off             B．kept up             C．taken up             D．held up

22、Our bad living habits will destroy the earth. Only by changing ______we live______ save the earth.

A．that ; we can         B．what ;we can        C．how; can we         D．where ; can we

21、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

20、—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

19、

18、

17、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

16、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

15、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