—I called you at 8 O’ clock yesterday evening, but nobody answered.— Sorry. I ______ the “ Moving China 2012” award on TV. I was so deeply moved that I missed your call.
This is______difficult problem that few students can work it out.
.He lives_______in the______village, but he is never_______.
Pollution is a serious problem. Scientists have _______ some good ways to save it.
We can’t put off _____ a plan .
I saw himwhen I passed by.