摘要： Be careful you cross the road.
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Be careful . You _______ cross the road when the traffic light is red . The traffic is heavy at this time of day .
| A．must | B．mustn’t | C．can | D．needn’t |
When you cross the road, you should be _____ and walk _____
A. carefully; careful B. careful; carefully
C. careful;, careful D. carefully; carefully
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