16. Helen is much more kind to her youngest child than to the others,___________ of course, make the others unhappy.
A. who B. which C. she D. that
17. --Could I use your bike, Jack?
--Of course, you____________.
A. can B. may C. could D. might
18. We must keep our room clean. Dirt and disease go , you know.
A. from time to time B. hand in hand
C. step by step D. one after another
19. During the ten-day vacation, they traveled to France their own expense
A. on B. with C. at D. in w*w*w*k*s*5*u*c*o*m
20. If human beings had been a bit less greedy and cruel, more birds and animals dying out.
A. ought to avoid B. could have been avoided
C. should have avoided D. might have avoided
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