40.________environmental damage is done,it takes many years for the ecosystem to recover.

A.Even if　　　　 B.If only　　　　　　　 C.While　　　　　 D.Once

39.The cost of living in Glasgow is among the lowestin Britain,________the quality of life is probably one of the highest.

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

38.That was really a splendid evening.It’s years________I enjoyed myself so much.

A.when　　　　　 　B.that　　　　　　　 C.before　　　　　 D.since

37.It wasn’t until nearly a month later________I received the manager’s reply.

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

36.________I accept that he is not perfect,I do actually like the person.

A. While　　　　　 B.Since　　　　　　　 C.Before　　 　　　D.Unless

35.-Did you remember to give Mary the money you owed her?

-Yes,I gave it to her________I saw her.

A.while　　　　 B.the moment　　　　　 C.suddenly　　　　 D.once

34.The WTO cannot live up to its name________it does not include a country that is home to one fifth of mankind.

A.as long as　　　 B.while　　　　　　　 C.if　　　　　　　 D.even though

33.You should try to get a good night’s sleep________much work you have to do.

A.however　　 B.no matter　　　　 C.although　　　　 D.whatever

32.-Was his father strict with him when he was at school?

-Yes.He has never praised him________he became one of the top students in his grade.

A.after　　　　 B.unless　　　　　 C.until　　　　　 D.when