改错。每句话都有一处错误，改正过来并把正确的句子写在横线上。

1. How many line make a triangle?

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2. Mr. Wood teach us English.

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3. There is five pencils in my pencil-box.

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4. It's a umbrella.

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5. Time to school.

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读“哈尔滨和广州各月气温曲线”图，回答下列问题．

（1）甲、乙两图分别表示______和______（城市）的各月气温曲线图．

（2）两地一月平均气温大约相差______℃，反映了我国冬季气温分布特点是______．

（3）两地七月平均气温大约相差______℃，反映了我国夏季气温分布特点是______．

（4）每年元旦时期，两城市中______白昼较长．