41、We all feel sorry for __________ for so long after your arrival.
A．keep you waiting
B．having kept you waiting
C．waiting for you
D．keep you wait


42、 He spoke so quickly that I didn't________ what he said.
A．receive
B．accept
C．listen
D．catch


43、 Please keep an eye on my luggage, and I' 11 be back __________.
A．in time
B．in no time
C．at one time
D．at a time


44、 He is sincere and easy to________
A．get down to
B．get at
C．get along with
D．get over


45、 Do you think they have________food for all these people here?
A．subsequent
B．beneficial
C．Sufficient
D．average


46、 He got up to the roof ________a ladder.
A．by all means
B．by any means
C．by means of
D．by no means


47、 The interviewer should take down notes at the moment the person __________ "answers the questions.
A．to be interviewed
B．interviewing
C．being interviewed
D．interviewed

48、 One must try his best to__________ to the new environment.
A．adopt
B．adapt
C．adept
D．apt


49、 Sometimes children have trouble __________ fact from fiction and may believe that such things actually exist.
A．to separate
B．separating
C．for separating
D．of separating


50、 The police were given an order that the stolen documents must be recovered at all________
A．accounts
B．Conditions
C．Payments
D．costs