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35. A. more difficult B. more complex  C. easier       D. closer

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34. A. only if       B. if only         C. even if      D. as if

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33. A. it           B. them          C. that        D. those

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32. A. did          B. does          C. has         D. have

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31. A. easy        B. difficult        C. useful       D. useless

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30. A. is weighed   B. are weighed   C. weighs      D. weigh

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29. A. has been to show          B. has been shown  C. has shown  D. shows

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28. A. similar     B. complex      C. public       D. different

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27. A. first few    B. few first       C. a few first     D. first a few

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26. A. difficulty   B. complexity    C. simplicity        D. difference

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