________ you ________ when he called you?

My father came back from work. (合为一句)

I was doing my homework________my father came back home.

________ I was doing my homework, my father came back home.

________ you ________ when the UFO arrived?

A:She spent ￥100 on the new skirt.

B:She _　　  ￥100 _　　  the new skirt.

A:He went to sleep after his mother came back.

B:He _     go to bed _     his mother came back.

A: What about going out for traveling?

B: __ 　　   going out for traveling?

A:Why don't you call him up ?

B: __  　　 give him a telephone call?

A: Crouching Tiger, Hidden Dragon got the prize on the Film Festival.

B: Crouching Tiger, Hidden Dragon won the ______on the Film Festival.

A:I can finish the simple job easily.

B: I will ________ finish the simple job easily.

The problem is too difficult for me to work out．(同义转换)

The problem isn't ________ for me to work out．