It's ______ he helped you that I'm ready to help him.
If only I _____ my watch!
What should we do if it _____ tomorrow?
--- “What will you do during the summer holiday?” --- “I don’t know, but it’s high time _____ something.”
I’m glad I went over all my notes; otherwise _____ .
--- “Have you ever been to Beijing?” --- “No, but I wish I _____”