根据句意，用所给词的适当形式填空：【小题1】The postmen’s (postman) wives donated a lot of money to the children

根据句意，用所给词的适当形式填空：
【小题1】The postmen’s (postman) wives donated a lot of money to the children in need.
【小题2】I found my father still awake (wake) when I entered his room at 11 last night.
【小题3】The room is too dirty. It requires cleaning/to be cleaned (clean) every day.
【小题4】From the unhappiness (happy) on his face, we know that he failed the exam.
【小题5】A 5-year-old child is sure to have difficulty explaining (explain) such hard problems.
【小题6】Do you think achieving (achieve) the balance between study and play is possible?
【小题7】At present not only the students but also their teacher is asked (ask) to come to school on time.
【小题8】How sadly (sad) she was telling me that he lost another bike!
【小题9】—Kate, didn’t you hear the loud knock at the door?
— Sorry, I was chatting ( chat ) with my e-friend.
【小题10】The book isn’t mine .It belongs to her (she)

解析：【小题1】句意：邮递员的妻子们捐赠了许多钱给困难中的孩子们。结合语境及所给单词，可知填复数名词postmen的名词所有格postmen’s，邮递员们的，作定语。【小题2】句意：当我昨晚十一点进入他的房间时，我发现我的父亲仍旧醒着。结合语境及所给单词，可知填形容词awake，醒着的，作宾语补足语。【小题3】句意：房间太脏了。需要每天打扫。原形动词不能直接用作动词宾语，结合所给单词可知填非谓语动词cleaning/to be cleaned，打扫。注意现在分词作宾语表示抽象动作，不定式作宾语表示具体的将要进行的一次性动作。【小题4】句意：从他脸上的愁容，我们知道了他考试不及格。本句中from是介词，后面接名词作宾语，结合所给单词，可知填unhappiness，忧愁，烦恼。抽象名词不可数，故用原形即可。【小题5】句意：一个五岁的孩子解如此难得问题肯定有困难。现在分词作状语表示句子主语正在进行的伴随性动作，结合语境可知填现在分词explaining，解释，说明。【小题6】句意：你认为在学习和玩乐之间取得平衡是可能的吗？动名词作宾语表示抽象动作，结合语境及所给单词，可知填动名词achieving，取得，作宾语。【小题7】句意：目前不但是学生们，而且他们的老师也被要求按时到校。结合语境可知本句主语是被要求的对象，故用被动语态。由not only……but also连接的并列主语后的谓语动词的数与后一个主语保持一致，teacher是单数，故填：is asked，被要求。【小题8】句意：她是多么伤心地告诉我她又丢了一辆自行车啊！结合语境及所给单词，可知填副词sadly，伤心地。【小题9】句意：凯特，你没有听见门上巨大的敲门声吗？——抱歉，我（刚才）正在和网友聊天。结合语境可知下文描述的是过去正在进行的动作，故用过去进行时态，填：was chatting，正在聊天。【小题10】句意：这本书不是我的。它属于她。结合语境及所给单词，可知填名词性物主代词her，她的。

就是这个解释