单项选择题

Friendship helps us understand （）we are, （）we need each other and （）we can do for each other.

A. what when that
B. who why what
C. where why that
D. who when how much

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单项选择题

Many people keep dogs as pets because dogs are regarded as（）friends to people.

A.lonely
B.only
C.loyal
D.fair

单项选择题

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job — （）my students have a try

A. Shall
B. Must
C. Will
D. May

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