27. ― The light in the office is still on.
― Oh , I forgot .
A. turning it off B. turn it off C. to turn it off D. having turned it off
26. Tom's mother kept telling him that he should work harder , but didn't help .
A. he B. which C. she D. it
25. I don't know what was for supper .
A. it B. there C. that D. food
24. She is already 50 , but she doesn't look .
A. like B. this C. it D. such
23. It is not you who in trouble ; it is I who in trouble .
A. are ; am B. are ; is C. are ; are D. is ; is
22. We think useless theory without practice .
A. it ; learning B. it ; learn C. that ; learning D. that ; to learn
21. My pen is lost and I can't find anywhere , so I must buy .
A. it ; one B. one ; it C. it ; it D. one ; one
20. I find difficult him to do such work .
A. it ; of B. it ; for C. that ; of D. that ; for
19. Look , someone is coming . Who can be ?
A. he B. she C. that man D. it
18. is no doubt that he will succeed in his experiment .
A. It B. This C. That D. There
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