41、 By the time the war________, most of the people had already left.
A．broke out
B．broke up
C．intervened
D．happen


42、 No sooner__________ than he realized that he should have remained silent.
A．the words had spoken
B．had the words spoken
C．the words had been spoken
D．had the words been spoken


43、 According to the weather forecast, which is usually __________ , it will snow this afternoon.
A．accurate
B．precise
C．exact
D．perfect


44、 He was________enough to understand my questions from the gestures I .made.
A．Intelligent
B．Efficient
C．Proficient
D．Diligent


45、 ________work has been done to improve people' s living standard.
A．Many
B．A great many
C．A large number of
D．A great deal of


46、 My father was asked to________the New York office.
A．take part in
B．take place
C．take over
D．take in


47、 I remember her face but I cannot__________ where I met her.
A．recall
B．remind
C．remember
D．remark


48、 If you don' t put the milk in the refrigerator, it may__________.
A．go by
B．go off
C．go on
D．go back


49、 You__________ yesterday if you were really serious about the job.
A．ought to come
B．ought to be coming
C．ought to have come
D．ought have come


50、 We hadn't met for 20 years, but I recognized her __________ I saw her.
A．for the moment
B．the moment when
C．at the moment when
D．the moment