How can they learn anything ______ they spend all their spare time watching television?
“You _______ be so tired that you had to stop to rest.”
He must have finished the work yesterday, _______ he ?
He must have lived here for 10 years, _______ he?
“Where is it?” “Where is _____? I don't know what do you mean?”
He was in great need of money, so he _____ $5, 000 for his car.