—What's the matter with John? He has been sitting there for hours.—A postcard from his father ________ an attack of homesickness in him.
Bad luck! I missed the last bus. ____, I had to walk home.
It smells so bad that you have to ____ until you come out.
The city of Qingdao is known ____ its beautiful seaside.
The information given by his brother _____ the mystery of his disappearance.
Do you expect _____ to be a possibility that we shall be able to afford the special furniture that we need?