35. A. more difficult B. more complex C. easier D. closer
34. A. only if B. if only C. even if D. as if
33. A. it B. them C. that D. those
32. A. did B. does C. has D. have
31. A. easy B. difficult C. useful D. useless
30. A. is weighed B. are weighed C. weighs D. weigh
29. A. has been to show B. has been shown C. has shown D. shows
28. A. similar B. complex C. public D. different
27. A. first few B. few first C. a few first D. first a few
26. A. difficulty B. complexity C. simplicity D. difference