单项选择
Teachers always tell us to try to be _______ honest student today and _______ useful man tomorrow.
A. a; an B. an; a C. an; an D. a; a
B
--George, how can you prove(证明)the earth is round?
--I can’t, sir. _______, I never said it was.
A. Except B. Unless C. Besides D. Including
C
I hope everyone can care about _______ the environment and stop _______ things.
A. protecting; wasting B. protecting; to waste
C. protect; wasting D. protect; to waste
A
--I want to borrow the book, but I don’t know how long it may _______.
--For two weeks.
A. borrow B. be borrowed C. keep D. be kept
D
Do you want to be healthy? _______. Smiling can help you stay healthy.
A. Smile B. Smiling C. To smile D. Smiled
A
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