It is dark outside, so please____ your step while going down the stairs.
Many officials _______ the matter were arrested and would be put in prison.
The next thing he saw was smoke ____from behind the house.
The living room is clean and tidy , with a dining table already ____ for a meal to be cooked .
I was so familiar with him that I recognized his voice _____ I picked up the phone .
It sounds like something is wrong with the car’s engine.______, we’d better take it to the garage immediately.