根据答句，写出相应的问句。

1. _____________________________________________

    I usually go to school by bus. 

2. _____________________________________________

    I am going to wash my clothes this evening.

3. _____________________________________________

    You can go to the cinema by the No. 15 bus.

4. _____________________________________________

    Yes, the park is next to the library.

5. _____________________________________________

    I am watching TV now.

计算控件的控什来源属性计算表达式设置一般为______开头的。

A．双引号

B．等号(=)

C．括号

D．字母