______careful when you cross the street. [ ]A. Don"t be B. Be

题型：专项题难度：来源：

______careful when you cross the street.    [     ]
A. Don"t be
B. Be
C. Being
D. Do

答案

举一反三

_____ afraid of making mistakes !
A. Don"t be
B. Not to be
C. Not being
D. Be not

题型：专项题难度：| 查看答案

—Shall I lock the lab before I go home?
—_____! I"ll check it myself later.
A. Go ahead
B. No problem
C. No hurry
D. Don"t bother

题型：同步题难度：| 查看答案

_____ and you will be in hell; Keep up and you will be in paradise.
A. Lose heart
B. Lose your heart
C. Losing heart
D. Losing your heart

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___ the red switch on the left and the flying machine will swiftly go up into the air and ____its journey.     [     ]
A. Pressing; begins
B. Press; begin
C. Pressed; begins
D. To press; to begin

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__________ your compositions carefully and some spelling mistakes can be avoided.[     ]
A. Having checked
B. Check
C. If you check
D. To check

题型：山东省模拟题难度：| 查看答案