. What ________beautiful day it is! Why not go out for _______picnic?
—Do you think we are going the right way to the Forbidden City? —Sorry, I’m not sure.But it _______ be.
The reason for his success is ______ he worked very hard.
Word came _______ the students would put off the outing until next week, when they wouldn’t be busy.
He ______ at once when I promised to help him.
After going into the concert hall, the mother _____ a friend and went over to greet him.