_________it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal.
He is very busy. I don’t know if he _____ or not tomorrow.
“What place is it?” “Haven’t you found out we _____ back where we ______?”
He has changed a lot. He _______ not what he _______.
Mr Smith ______ a book about China last year but I don’t know whether he has finished it.
“It’s twelve o’clock, I think I must be off now.” “Oh, really? I ______ it at all.”