31.It was not until 1920 ______ regular radio broadcasts began.
A.while B.which C.that D.since
30._______ you diet and take more exercise ______ be able to keep fit.
A.Only if , you will B.Only if, will you
C.Unless, will you D.Unless, you will
29.As nobody here knows what is wrong with the machine, we must send for an engineer to _____ the problem.
A.handle B.raise C.face D.present
28.My brother was so _______ reading the novel that she didn’t realize the food had got bad.
A.absorbing B.absorbing in C.absorbed in D.absorbed to
27.---The lights were left on all night long.
---Yes.It seems that Tom is ______.He was the last one who left the classroom yesterday evening.
A.blaming B.blamed C.to be blamed D.to blame
26.______ her nose, Mary is a beautiful girl.
A.Besides B.Apart from C.Except that D.Now that
25.The band around the corner was robbed last night.The police are now ______ the matter.
A.looking after B.looking for C.looking into D.looking out
24.The professor told us that his conclusion was based ______ his further research about that then.
A.on B.about C.for D.above
23.______ delighted me most was ______ my daughter was admitted to Beijing University.
A.That, what B.What, that C.What, what D.That, that
22.Finding her car stolen, _________.
A.a policeman was asked to help
B.the area was searched thoroughly
C.it was looked for everywhere
D.she hurried to a policeman for help
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