21. There was a teapot fashioned like a china duck, out of ____ open mouth the tea was supposed to come.
A. which B. its C. that D. whose
22. There is not a conductor resists the flow of the electrical charges.
A. which B. but C. that D. it
23. A man escaped from the prison last night, It was a long time the guards discovered what had happened.
A. before B. until C. since D. when
24. Moreover, in the modern age human beings, depend so much on machines, Francis Chichester had given men throughout the world new pride.
A. when B. whether C. more D. ever
25. we have finished the course, we shall start doing more revision work.
A. For now B. Since that C. Now that D. By now
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