题目内容
We ______ careful when we are walking across the road.There are too many vehicles now.
A. can be B. may be C. must be
C
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If we __________ careful，fire can be dangerous。
| A．don’t be | B．are | C．aren’t | D．won’t be |
题目内容
We ______ careful when we are walking across the road.There are too many vehicles now.
A. can be B. may be C. must be
C
If we __________ careful，fire can be dangerous。
| A．don’t be | B．are | C．aren’t | D．won’t be |