. I was embarrassed to admit that yesterdayI ______ a serious error.

These kids are quick at learning We hadbetter have them __ in a new way

When the fire broke out, Mary didn’t know _____. [ ]

______ the global financial crisis,the Chinese government has taken measures ______ people’s life to deal with it

Where are my model planes, mom—–Sorry, I don’t know. Oh, look, they are_________.