We ________(听到) him singing in the next room when we passed.
The tired children don’t get home _________(直到)7 pm.
While the boy was (争吵) with his sister, their mother came into the room.
The dog has three legs. How ________(奇怪的) it is!
Many athletes give money to schools and charities, and do a lot of work to help people.
This is a great ______(机会) that many people do not have.