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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写出执行完下列代码段之后指定变量的值： bool x=true，y=false，z=false； x=x&&y||z； y=x||y&&z； z=!(x!=y)||(y==z)； 则x=false，y=false，Z=