1.This is the first time astronomers__the whole process of a

1.This is the first time astronomers__the whole process of a black hole__a star,from its first to nearly final bites.
a)see,eat b)have seen,eating c)saw,eaten d)had seen,eat
2.A team of Japanese scientists have found a gene closely__to nicotine addiction,which could lead to more effective ways for smokers to kick the habit.
a)to be linked b)linking c)linked d)being linked
3.There's been a lot of interest among the parents as well as students__the Chinese language.
a)learn b)to learn c)learning d)who learn
4.When__some people in this country__to feel they had a right to make their religious beliefs public policy for the rest of us?
a)did,that began b)was it,that began c)was,that began d)was it that,began
5.There are currently few instances__people are directly exposed to the new materials
a)where b)which c)when d)for which
6.I was thinking hard over the problem of getting enough money for my new term__a nice idea occured to me.
a)as b)when c)while d)then
7.his review highlighted the disastrous economic and environmental__if the world failed to take deal with global warming.
a)consequences b)efficiency c)advances d)symptom
8.Dozens of people who came into contact with ex-spy have also been tested for__to polonium 210.
a)approach b)access c)sentence d)exposure
9.Experts yesterday urged the government to __strict measures to make future clinical drug trials safer.
a)compose b)impose c)imply d)postpone
10.Colleges have to take __the responsibility for graduating the kids they admit,and if they don't,maybe they ought to pick up the student loan burden of the people who don't finish.
a)urgently b)purposefully c)seriously d)sufficiently

1.b 2.b 3.c 4.b 5.d 6.b 7.a 8.d 9.a 10.d