句型转换（每空一词）。

1. They have to stay at school all day.（对画线部分提问）

                     they have to        all day?

2. Today is Tuesday the 20th.（对画线部分提问）

                     ？

3. Let's go to the movies.（改为同义句）

                     going to the movies?

4. Can you come to my house for dinner?（作肯定回答）

    ___    _，         love to.

5. Li Lei has to babysit his sister.（改为一般疑问句）

             Li Lei        to babysit his sister?

铣床上铣出的锥齿轮齿形曲线是不精确的，当齿轮的齿数越少，齿轮宽度越小时，其误差也就越大。