We didn’t feel surprised when we found he fixed his eyes on the food with a(n)________expression on his face,for we knew that he hadn’t eaten anything for 3 days.
Has ________ been decided when we are to hold the sports meeting?
—Who knocked at the door? —I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ________ was.
The doctor kept telling him that he mustn’t smoke, but ________ didn’t help.
Don’t leave your keys in the car. Someone might steal ________ 。
Computers must be of great use to ________ doing the scientific research.