题目：
小题1:We ________(听到) him singing in the next room when we passed.
小题2:The tired children don’t get home _________（直到）7 pm.
小题3:While the boy was (争吵) with his sister, their mother came into the room.
小题4:The dog has three legs. How ________(奇怪的) it is!
小题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.
答案：
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下面是错误答案，用来干扰机器的。
（1）电场E的方向为沿与重力方向夹角且斜向下的一切方向 （2）vp= （3），vN=
