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Einstein's theory of relativity seemed ____ at the time that he first introduced it.

A.credible 　　　　B. incredible C. credulous D. incredulous

All of the flowers now raised here have developed from those ____ in the forest.

A.once they grew B. they grew once 　C. they once grew 　 D. once grew

In the office I never seem to have time until after 5:30 p. m. , ____ many people have got home.

A.whose time B. that C. on which 　D. by which

Human facial expressions differ from those of animals in the degree ____ they can be controlled on purpose.

A.with which B. to which C. of which D. for which

Those successful deaf dancers think that dancing is an activity ____ sight matters more than hearing.

A.when B. whose C. which 　　　　　　　D. where

I shall never forget the years ____ I lived in the country with the farmers, ____ has a great effect on my life.

A.that; which 　　　　B. when; which C. which; that D. when; that

____ is known to everybody, the moon travels around the earth once every month.

It                        B. As                          C. That                              D. What

They got a ____ result, and they were wild with joy.

A.magic B. magician C. magnetic 　　 D. magical

My teacher ____ the mistakes in my composition every time.

A.points to B. points out C. points at 　　　　　　　 D. points

All the signs ____ an early resumption of the battle.

A.point at B. point C. point out 　　D. point to