选择恰当的答语：
I can go at a________light.A. red B. yellow C.green
If you go on the road,you must know the________.A.traffic rules B. traffic C.lights
In U.S. you must wear a________when you ride a bike.A.helmet B.hat C.scarf
—Let’s go to Children’s Center!—______________________A.That’s all right. B.Thank you. C.Hooray!
—Excuse me. Can you help me?—_______________________A.By bus. B.Good. C.Yes.
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