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Đáp án: If people use a lot of vehicles, he air will be polluted.
Đáp án: Some old teacher will be invited to our class meeting.
Đáp án: It is the first time I have ever spoken to a foreigner.
Đáp án: New devices to help people live a longer life have been invented by scientists.
Đáp án: My daughter said that she was preparing for her coming exam then.
Đáp án: Vietnamese students have to wear uniforms when they go to school.
RewriteRewrite the following sentences so that the second sentence means the same as the first one
1. They will do the test well. They will review them all hard
If ...........They review all hard, They will do the test well.................................................................................
2. The people will protect the environment now. The environment will be nice
If .........The people protect the environment now, The environment will be nice...................................................................................
3. Did they give food to homeless people last year?
Was ......homeless people given food last year?........................
Đáp án: The small glass pieces will be melt under high temperature.