Private cars will be required to stay off roads one out of five weekdays ____ the traffic pressure.
Mom told him he was forbidden to watch TV for a month. _______, he stormed out of the room.
— Can I go now, sir?— If you _______ leave, do it quietly.
I wanted to _______ them the trouble of buying me a present. So I didn’t tell them about my birthday party.
Jack, to his _______, refused to get involved although his friends insisted on his trying the drug.
People sometimes think that shy people are cold and uninterested in other people _______ actually they are just afraid to meet them.