A) to change B) changing
C) changed D) change
43 It is quite necessary for a qualified teacher to have good manners and _________ knowledge.
A) extensive B) expansive
C) intensive D) expensive
44 Jean doesn't want to work right away because she thinks that if she __________ a job she probably wouldn't be able to see her friends very often.
A) has to get B) were to get
C) had got D) could have got
45 I felt somewhat disappointed and was about to leave, ________ something occurred which attracted my attention.
A) unless B) until
C) when D) while
46 A love marriage, however, does not necessarily ________ much sharing of interests and responsibilities.
A) take over B) result in
C) hold on D) keep to
47 The ability to store knowledge makes computers different form every other machine _______ invented.
A) ever B) thus
C) yet D) as
48 I'm not sure whether I can gain any profit from the investment, so I can't make a(n) ______ promise to help you.
A) exact B) defined
C) definite D) sure
49 I have kept that portrait ____________ I can see it every day, as it always reminds me of my university days in London.
A) which B) where
C) whether D) when
50 The sports meet, originally due to be held last Friday, was finally _______ because of the bad weather.
A) set off B) broken off
C) worn off D) called off
