-Alvin, are you coming with us?-I'd love to, but something unexpected __________.
—I think sometimes watching TV will cause visual pollution to the teenagers.—_________.
You had better ____ some money for your daughter.
I don’t know whether you happen ____ that he has been away for two months.
When the children are busy playing their games.They had better be _____
The boy made ____ fun of me, so I became angry ____ him.