46、 TheY decided to chase the cow away__________ it did more damage．
A．unless
B．until
C．before
D．Mthough


47、 I don’t think it is any use__________ this matter any further．
A．discussing
B．to discuss
C．to discussing
D．to be discussed


48、 John likes Chinese food，bm he__________ ．eating with chopsticks．
A．doesn’t used to
B．does．n’t use to
C．isn’t used to
D．used not to


49、 Is there any__________ medicine to cure that patient of his illness?
A．efficient
B．effective
C．attractive
D．enjoyable


50、 The results are reliable since the tests have been carried out by a__________doctor．
A．quMified
B．sufficient
C．desperate
D．adequate


51、 We use plastics__________ wood and metal now．
A．to take place
B．to take over
C．take the place of
D．in place of


52、 It is wise to have some money__________for old age．
A．put away
B．kept away
C．laid down
D．given away


53、 She__________ her trip to Singapore because she was ill．
A．called off
B．closed down
C．put up
D．went off


54、 __________ plastics，the washing machine is light in weight．
A．Made of
B．Making of
C．To make of
D．To be made of


55、 Our English teacher had．US__________ compositions every Friday·
A．to write
B．written
C．write
D．wrote