题目内容：

1.We ________(听到) him singing in the next room when we passed.

2.The tired children don’t get home _________（直到）7 pm.

3.While the boy was          (争吵) with his sister, their mother came into the room.

4.The dog has three legs. How ________(奇怪的) it is!

5.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.