下边句子中加横线的熟语，能够替换为括号中成语的一项是（ ）

I was just going to cut my rose bushes but someone it.Was it you

Would you help me clean up the classroom, Bill —____________.

Now that you like the portable personal computer so much, why not buy one? It is of great use to your work —- Well, I can’t afford _____ computer at present

She pretended _____ me when I passed by.