—What color is this quilt?—It’s ___________.
–What do you call this in English?–It’s stamp. It is used ____ sending letters.
Nobody can stop me ____ working hard at English.
Our sports meeting has been ____ till next Monday because of the bad weather.
Do you know the young lady ____ your mother is talking?
Tim’s mum is worried ____ her son’s eyesight as he playsonline games too much.