to _________the road safely, we must learn to understand the traffic sign.

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• 用can,must,musn't,have to,has to填空Do you understand all these road-sighs?Look at the traffic lights.They are red.You _________ stop your car.Now,they are green,you ________ move on.There is a sign with "NO PARKING".You _________ leave your car there.You ________ park your car in the right place.A driver __________ learn traffic rules well.He ________ get a driver's license.
• to _________the road safely, we must learn to understand the traffic sign.
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