-Do you have an __________ way to solve this problem?-No, this is the only way, I think.
---Could I use your computer for a while? --- _______. Go ahead.
We are now in senior three. I think it’s time we ______ more efforts for the college-entrance exams.
---Look! There comes our head teacher. ---That ______ be him. He is in Indonesia.
All things ______, your sister has better performances than you.
Seeing Mary can cheer you up. She seldom appears ______ happy.