Mr Hill stayed there for a few weeks(划线部分 for a few day）(就划线部分提问）
How long did Mr Hill stay there?
You shouldn't pollute water(改为祈使句）
Don't pollute water
Water covers about two thirds of Earth.（划线部分two thirds）（对划线部分提问）
How large of Earth does water cover.
Our headmaster was talking to the reporter(划线部分 the reporter）（对划线部分提问）
Whom did your headmaster talking to?
I go to bed after I finish my homework.（改为同义句）
I usually go to bed when I finish my homework.
I am valuabe,like liquid gold.（用as..as转换成同义句）
I am as valuable as liquid gold.
She was washing her face and the tap was on.（改为同义句）
She was washing her face when the tap on.