4. _______ is known to us all that only the theory 　_______ practice can be practical.

A.　 Which; base on

B.　 It; based on

C.　 As; based on

D.　 What; basing on

3. Scientific experiments　 _______ students without the teacher?s instructions can be dangerous.

A.　 carry out　 　　　　 　　B.　 carrying out by

C.　 carrying by　　 　 D.　 carried out by

2. If you　 _______yourself to the job in hand, you?ll soon finish it.

A. request　　　 　 B. appeal　

C. apply　 　　　 　　 D. claim

5. 儿子通过考试使我大为欣慰。(to one?s delight)

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4. 教授在几位助教的陪同下走进了报告厅。(accompany)

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3. 雇员们提高工资的要求遭到雇主的拒绝。(demand; turn down)

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2. 当向老板申请工作时，你应当提供详细的个人资料。(apply)

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1. 他独自一人在家时，总是拿不定主意该做什么。(uncertain)

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5. They claimed that a vegetarian diet　 ________　 a meat diet.