D.brought up
15.After several years' research,scientists now have a________better understanding of the HIV.
very Bfar Cfairly DQuite
16.Many new opportunities and challenges ________ in the future for those with a university education.
A.are open
B.have been opened
C.are open up
D.will be opened up
17.Thirty percent of Jane's income ________ on clothing every year.
A.is spent
B.had been spent
C.is being spent
D.has been spent
18.If Newton lived today,he would be surprised by what ________ in science and technology.
Ahad discovered B.had been discoveredC.has discovered D.has been discovere
19.He had planned to go there ________ 9:00 a.m.,but the train is ________ time.
Aon;onBby;behindCby;onDon;ahead
Only by ________ science and technology can we make our country stronger.
A.rely on Brelying on Cdepend on Ddepending
21. “Listen, there_____.
”
Oh,yes.There_____.
”
A. goes the bell; it goes
B. goes the bell; goes itC. the bell goes; it goes
D. the bell goes; goes it
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