During his stay in the USA, Yao Ming returned to China______he was needed.
It’s generous _________ them to donate money to UNICEF. They think it important __________ them to help poor children go to school.
---Are you going to take part in the speech competition? --- _____. It’s too good a chance to miss.
Money is important in my life, but it isn’t_______ to me.
---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.
It’s clever _____ her to work out _____ many difficult math problems.