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________ all the pictures , I think that one ________.

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________ our eyes, we can see more than ________ stars on a clear night.

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Chinese is ________ language to learn. Students must work hard at it.

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The Great Green Wall is ________ and ________.

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A．long 7,000km, wide 400 and 1, 700 km.

B．7 , 000 km. long, 400 and 1, 700 km . wide

C．long 7 ,000km, wide between 400 and 1, 700 km.

D．7 , 000 km . long , between 400 and 1, 700 km . wide

We get to know that it' s important ________ us ________ plant more trees .

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Why should trees ________ on the mountains ?

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The river smells terrible. People must ________ dirty things into it.

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The woman ________ blue is Li Hua's mother.

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The water must be ________ too hot ________ too cold.

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Neither you nor she ________ hard at English.

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