See the flags on top of the building? That was _______ we did this morning.(2006年全国I高考题)
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?