7．
explain，take part in，not mean，know，miss，invite，discuss
51．I am sorry youhave missed the last train．It left thirty minutes ago．
52．The young teacher thought it easyto explainthe project to the students．
53．The volunteers from our citywill take part insome training before they go to Tibet．
54．-As a well-known actor，are you feeling happy？
-Not really．Sometimes I have a hard timeknowingwho my real friends are．
55．A famous inventorwas invitedto our school last summer vacation．
56．Don't bother your brother while heis discussingsomething with his classmates．
57．Singing English songs welldoesn't mean you can speak English well．

分析 51．很抱歉你已錯(cuò)過(guò)了最后一班火車(chē)．它是30分鐘前開(kāi)走的．
52．年輕老師認(rèn)為給學(xué)生解釋這項(xiàng)課題很容易．
53．我市的志愿者在去西藏前將參加培訓(xùn)．
54．--作為著名演員，你覺(jué)得快樂(lè)嗎？--并不真正快樂(lè)．有時(shí)我很難知道我真正的朋友是誰(shuí)．
55．去年暑假我校邀請(qǐng)了一位著名發(fā)明家．
56．你哥哥在跟同學(xué)討論問(wèn)題時(shí)，請(qǐng)不要打擾他．
57．唱英語(yǔ)歌曲唱得好并不說(shuō)明你英語(yǔ)說(shuō)得好．

解答 51．have missed．考查現(xiàn)在完成時(shí)．根據(jù)下文"It left thirty minutes ago"所說(shuō)，火車(chē)是半小時(shí)前開(kāi)走的；根據(jù)"sorry"一詞，判定火車(chē)已走，則為錯(cuò)失（miss），本句要用現(xiàn)在完成時(shí)，動(dòng)詞為"have+過(guò)去分詞"形式．miss的過(guò)去分詞為missed．故填have missed．
52．to explain．考查"it+形容詞+動(dòng)詞不定式"句型（動(dòng)詞不定式作賓語(yǔ)）．分析本句成分，其結(jié)構(gòu)為"主語(yǔ)+謂語(yǔ)+it（形式賓語(yǔ)）+形容詞（賓語(yǔ)補(bǔ)足語(yǔ)）+動(dòng)詞不定式（真正賓語(yǔ)）．這樣，空格上為動(dòng)詞不定式，作真正賓語(yǔ)．根據(jù)英語(yǔ)提示，project【（學(xué)生的）課題】需要解釋?zhuān)╡xplain）．explain的不定式為to explain．故填to explain．
53．will take part in．考查一般將來(lái)時(shí)．根據(jù)英語(yǔ)提示，特別是training（培訓(xùn)）與動(dòng)詞take part in有關(guān)．take part in參加．根據(jù)狀語(yǔ)從句"before they go to Tibet"確定主句用一般將來(lái)時(shí)．will take part in將要參加．故填will take part in．
54．knowing．考查 have a hard time doing sth句型．have a hard time意思是"過(guò)得很辛苦（困難）"，后面跟動(dòng)名詞，表示做某事很辛苦．從句"who my real friends are'"為賓語(yǔ)從句，所以，空格上要填一個(gè)及物動(dòng)詞的動(dòng)名詞形式．know知道，了解．have a hard time knowing難以了解（分清）．故填knowing．
55．was invited．考查一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)．根據(jù)英語(yǔ)提示，特別是inventor（發(fā)明家）和to our school（到我校），需要用到動(dòng)詞invite（邀請(qǐng)）．根據(jù)時(shí)間狀語(yǔ)"last summer vacation"（去年暑假），確定事情發(fā)生在過(guò)去，故用一般過(guò)去時(shí)．另外，主語(yǔ)inventor和動(dòng)作invite是被動(dòng)關(guān)系，故用被動(dòng)語(yǔ)態(tài)，即"be+過(guò)去分詞"形式．主語(yǔ)為第三人稱(chēng)單數(shù)，動(dòng)詞be要用is的過(guò)去式was．故填was invited．
56．is discussing．考查現(xiàn)在進(jìn)行時(shí)．while引導(dǎo)的時(shí)間狀語(yǔ)從句多用進(jìn)行時(shí)態(tài)，即"be+現(xiàn)在分詞"形式．分析句意可知，當(dāng)哥哥和同學(xué)在做某事時(shí)不要打擾他．根據(jù)英語(yǔ)提示，特別是something（某事），和discuss有關(guān)．discuss為動(dòng)詞，意思是"討論"，其現(xiàn)在分詞為discussing．主語(yǔ)為第三人稱(chēng)單數(shù)，助動(dòng)詞be要用is，故選填is discussing．
57．doesn't mean..考查一般現(xiàn)在時(shí)．分析句子成分，動(dòng)名詞短語(yǔ)（結(jié)構(gòu)）Singing English songs well為主語(yǔ)，表示一個(gè)事情（情況）；"you can speak English well"為賓語(yǔ)從句，所以句子缺少謂語(yǔ)，需要填一個(gè)及物動(dòng)詞．mean為及物動(dòng)詞，意思是"意味著"，選項(xiàng)中表示要用其否定形式．從句意看，英語(yǔ)歌唱得好并不意味著英語(yǔ)說(shuō)得好．這是一個(gè)事實(shí)，也是條真理性的說(shuō)法，故用一般現(xiàn)在時(shí)．主語(yǔ)為第三人稱(chēng)單數(shù)，動(dòng)詞否定式為doesn't mean．故填doesn't mean．

點(diǎn)評(píng) 首先要掌握句子的意思，然后結(jié)合具體的題目以及給出的英語(yǔ)單詞提示，就可以確定正確答案．

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