49.In this experiment, they are woken up several times during the night, and asked to report what they＿＿＿＿.

A.had just been dreaming　　 B.are just dreaming

C.have just been dreaming　 D.had just dreamt

48.When he was alive, the old scientist used to say that knowledge ＿＿＿＿from practice and he gained his experience by doing a lot of practical work.

A.was coming　　　　 B.had come

es　　　　　　 D.would come

47.She ＿＿＿＿＿ to the office than she got down to writing the report.

A.has no sooner got　　　　 B.had　 hardly got

C.no sooner got　　　　　　 D.had no sooner got

46.He ＿＿＿articles for our wall-newspaper these three years, and he ＿＿＿about forty articles.

A.has been writing； has written

B.has been writing； wrote

C.is writing； has been writing

D.has written； has written

45.-- Look at the black clouds.It ＿＿＿＿＿＿ soon.

-- Sure.If only we ＿＿＿＿＿out.

A.is raining； didn’ t come

B.is to rain； won’ t start

C.will rain； haven’ t started

D.is going to rain； hadn’ t come

44.The children ＿＿＿＿＿＿ very quiet； I wonder what they ＿＿＿＿up to.

A.were； are being　　　 B.are being； are

C.are； do　　　　　　　 D.are being； do

43.Jim talked for about half an hour yesterday.Never＿＿＿＿＿ him talk so much.

A.I heard　　　　　　　 B.did I hear

C.I had heard　　　　　 D.had I heard

42.-- ＿＿＿＿＿ Betty this morning?

-- Not yet, but she is sure to be here before noon.

A.Have you seen　　　　 B.Will you see

C.Do you see　　　　　　 D.Did you see

41.-- Are you a visitor here?

-- That’s right.I＿＿＿round the world and now my dream of coming to China＿＿＿true.

A.have traveled； has come

B.was traveling； had been come

C.am traveling； has come

D.have traveled； has been come

40.All but one＿＿＿＿take part in the conference＿＿＿＿tomorrow.

A.is going to； that is to take place

B.are going to； that is about to take place

C.are going to； that is to be taken place

D.are going to； which is to be held