41.Early to bed and early to rise ______ a man healthy, happy and wise.
a. making b. to make c. make d. makes
42.Mathematics ______ the language of science.
a. is b. has been c. are d. have been
43.The young ______ the vital forces in our society.
a. is b. has been c. are d. have been
44.Every man, woman and child ______ some history, enough at least, to survive in the world.
a. knows b. know c. is known d. are known
45.None of them ______ my friends.
a. is b. are c. was d. has been
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