按要求改写下列句子。

1. Tom is in Class Six.Mary is in ClassSix,too.( 改为同义句)

    They are in _____ _____ _____.

2. There are many books on the table, _____ _____?( 完成反意疑问句)

3. His father has been a teacher for five years.( 就画线部分提问)

    _____ _____ has his father been a teacher?

4. It is time for supper. ( 改为同义句)

    It is time _____ _____ supper.

5. Maybe he is at home. ( 改为同义句)

    He _____ _____ at home.

中央分隔带（中间带）常用于（），主要用以分隔对向行驶的车辆

A.高速公路

B.一级公路

C.二级公路

D.三、四级公路