句型转换。

1. Yesterday mother bought me a computer.(改为同义句)

    Yesterday mother _____a computer _____ _____.

2. The students do some cleaning on Saturday.(对画线部分提问)

    _____ _____ the students do _____ cleaning?

3. John has gone to school．(用by the time改写)

    John _____ _____ to school by the time I called him.

4.I was late for school because my alarm clock didn't go off.(对画线部分提问)

   _____ _____you late for school?

5. By the time I got up, my brother had taken a shower.(对画线部分提问)

    What _____ your brother _____by the time you got up?

钩端螺旋体感染后抽血可检出抗体的时间为（）

A.2天

B.3～4天

C.6～10天

D.3周

E.4周