【题目】My sister started primary school last year. （改为一般疑问句）
your sisterprimary school last year?

【题目】Each class lasts 50 minutes in our school. （改为否定句）
Each class 50 minutes in our school.

【题目】We're discussing why ______ for our health．
A.are fast food bad
B.fast foods are bad
C.fast food is bad
D.is fast food bad

A. You’re welcome.B. That’s right.C. It’s hard to say.

【题目】我很少吃糖果因为糖分太多、对牙齿有害。

A.however B.but C.even though D.because

A. What B. How C. Who D. Where

A. did heB. does heC. didn’t he

【题目】You'd better _______ under the tree when it is raining in summer. It's dangerous.
A.not stand
B.stand
C.not to stand
D.to stand

A.what B.when C. where D.that