Alone in a deserted house, he was so busy with his research work that he felt ___but lonely.
We must keep our room clean. Dirt and disease go _____, you know.
--Could I use your bike, Jack?--Of course, you____________.
--____________?--He is tall and strong.
She suggested to the police in the police station that__________.
I told you that you shouldn't waste your time playing the computer games,_____________?