题目内容
When I walked past the park, I saw some old people ________ Chinese Taiji.
A. do B. did C. doing D. are doing
C
This is a street crossing. There are red and green lights at each corner. ______1________________When there is a green light, the cars may go.
______2_________________They must wait until the red light changes to green. Then they can go on. _______3___________They can make a right turn when the light is green or red._________ 4_________
Some people are color-blind(色盲). They can not tell the difference between the red and green lights.__________ 5___________________We must keep our streets safe. And we must obey the traffic rules. All of us should be very careful when we are near the traffic.
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1._________ 2.__________ 3._________ 4.__________ 5._________