The flowers his friend gave him will die unless __________ every day.
_____ is known to everybody, the moon travels round the earth once every month.
We are invited to a party _________in our club next Friday.
It sounds like something is wrong with the car’s engine. ______ , we’d better take it to the garage immediately.
It is illegal for a public official (政府官员) to ask people for gifts or money_____ favors(恩惠,帮助) to them.
The living room is clean and tidy, with a dining table already_____ for a meal to be cooked.