选择单词，补全短文。 hot China winter people old east Shanghai is the biggest city in（1）______．It's in the（2）______ of China. It's got a lot of（3）______．It's an（4）______ city. It's very（5）______ in summer and it's cold in（6）______．
用must和mustn’t填空。 1. You _____ wait for the green light. 2. You______ play on the street. 3. You _____ pick flowers. 4. You _____take good care of young children.
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