—Who _____ it be that is knocking at the door?—It ______be father, but I’m not sure.
Sarah hopes to become a friend of _____ shares her interest.
It is reported that nowadays more and more children _____ playing computer games.
She is so optimistic that her cheerful spirits and bubbling laughter _____ the whole class.
After seeing such a sad movie, she felt _____ all the evening.
The roads into London were so _____ traffic that even the fire engines couldn’t get through.