66.The mass of an object is multiplied by the speed of light squared, _____ other words , the speed of light is multiplied by itself.
a. byb. for c. ind. with
67.The new system encourages companies to compete with each other ______ equal terms.
a. onb. inc. with d. for
68.You should stick _____ the point in debate.
a. to b. at c. in d. for
69.Tom has been sad recently, for his plan to go to college _____ at the last moment.
a. fell out b. fell behind c. fell in d. fell through
70.David likes country life and has decided to ______ farming.
a. go in for b. go into c. go through d. go after
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