下列各句中加点成语的使用，正确的一项是

（2014年北京市西城区高三5月二模试题）28. It was unusual that such close neighbors ______ not know one another.

sfied______with the payment ,he took the job just to get some work experience

I was really too busy with my homework and I couldn’t help ____________ housework

By the time she went outside, the bus ____already ______ .