21.It has long been known that there is an electric field ______.
a.inside the earthb. inside earthc. inside an earthd. on earth
22.______ much harder work, the volunteers were able to place the raging forest fire______.
a. By the means of…under the controlb. By means of…under control
c.By means of…under a control d. By a means of…under control
23.No sooner had the man departed than the tree began dropping coffee beans ______.
a.by the thousand b. by a thousand c. by thousands d. by thousand
24.He expressed ______ of their having ever been married.
a.the doubt b. a doubt c. doubt d. an doubt
25.He saw through the little boy’s tricks ______.
a.at glanceb. at the glance c. at some glanced. at a glance
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