1. We shall probably never be able to _____ the exact nature of these sub-atomic particles.
[A] assert [B] impart [C] ascertain [D] notify
2. This diploma _____ that you have completed high school.
[A] proves [B] certifies [C] secures [D] approves
3. Up until that time, his interest had focused almost _____ on fully mastering the skills and techniques of his craft.
[A] restrictively [B] radically [C] inclusively [D] exclusively
4. That sound doesn’t _____ in his language so it’s difficult for him to pronounce.
[A] happen [B] take place [C] occur [D] run
参考答案： C B D C
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