--- Who are the teenagers gathering at the school gate? --- Well, if you _____ know, they are all my visiting students.
—How wide is the Yellow River? —Thatfrom where to where.
It is your own faultyou are so tired. You oughtn’t to have stayed up so late.
As teachers we should concern with what is said, not what we think.
To pay to see that movie will be foolishyou can see it on TV for nothing.
I’ll be away for a few days. If anything happens, telephone meemail me to save money.