【正文】 ，結(jié)構(gòu)是“am/ is/ are doi解析：B【詳解】句意：——那個(gè)糟糕的噪音是什么？——學(xué)生們正在準(zhǔn)備聚會(huì)。14．B【詳解】句意：——那個(gè)糟糕的噪音是什么？——學(xué)生們正在準(zhǔn)備聚會(huì)。根據(jù)題干中“Where is he?”可知要回答現(xiàn)在在哪里，用現(xiàn)在進(jìn)行時(shí)表示“正在圖書館學(xué)習(xí)”，其結(jié)構(gòu)為be doing；主語“he”是第三人稱單數(shù)，be動(dòng)詞用is。他在哪里？——哦，他在圖書館學(xué)習(xí)?？疾楝F(xiàn)在進(jìn)行時(shí)。13．C【詳解】句意：——我在教室里找不到邁克了。考查時(shí)態(tài)。takes off動(dòng)詞三單；is taking off現(xiàn)在進(jìn)行時(shí)；has taken of解析：B【詳解】句意：女士們，先生們，請(qǐng)留在座位上，系好安全帶，請(qǐng)將座椅靠背調(diào)整好。飛機(jī)正在起飛。故選D?？疾閯?dòng)詞時(shí)態(tài)?？疾閯?dòng)詞時(shí)態(tài)。故選A。考查時(shí)態(tài)。考查時(shí)態(tài)。故選B。will wash動(dòng)詞的一般將來時(shí)形式；is washing動(dòng)詞的現(xiàn)在進(jìn)行時(shí)形式；washes動(dòng)詞的三單形式；washed動(dòng)詞的過去式。他正在洗碗?？疾楝F(xiàn)在進(jìn)行時(shí)。9．B【詳解】句意：——約翰在哪里？——他在廚房里?？疾闀r(shí)態(tài)?！獙?duì)不起?？疾闀r(shí)態(tài)?！獙?duì)不起。故選A?？疾閯?dòng)詞時(shí)態(tài)。根據(jù)“Let’s go and help her”可知，此處指讓我們?nèi)椭谧鐾盹埖哪棠蹋蕿楝F(xiàn)在進(jìn)行時(shí)，其結(jié)構(gòu)為am/is/a解析：A【詳解】句意：奶奶正在做晚飯。我們?nèi)椭?。根?jù)“What are you up to”可知，答語要用現(xiàn)在進(jìn)行時(shí)，表示現(xiàn)在正在進(jìn)行的動(dòng)作，結(jié)構(gòu)為am/is/are doing，故選C。你在忙什么？——我正在做一個(gè)關(guān)于家族史的項(xiàng)目?？疾閯?dòng)詞時(shí)態(tài)。6．C【詳解】句意：——嗨，大明。根據(jù)“What’s that noise, Sam?”判斷，此處應(yīng)該用現(xiàn)在進(jìn)行時(shí)，其結(jié)構(gòu)是：be（am/is/are）+動(dòng)詞的現(xiàn)在分詞。根據(jù)“What’s that noise, Sam?”判斷，此處應(yīng)該用現(xiàn)在進(jìn)行時(shí)，其結(jié)構(gòu)是：be（am/解析：B【詳解】句意：——什么聲音，山姆？ ——我弟弟正在玩他的玩具車。5．B【詳解】句意：——什么聲音，山姆？ ——我弟弟正在玩他的玩具車?？疾閯?dòng)詞時(shí)態(tài)辨析。解析：C【詳解】句意：請(qǐng)保持安靜?？疾閯?dòng)詞時(shí)態(tài)辨析。4．C【詳解】句意：請(qǐng)保持安靜?？疾楝F(xiàn)在進(jìn)行時(shí)。根據(jù)“Tony, hurry up! We…for you now.”可知，此處強(qiáng)調(diào)動(dòng)作正在發(fā)生，用現(xiàn)在進(jìn)行時(shí)，故選解析：D【詳解】句意：——托尼，快點(diǎn)！我們現(xiàn)在在等你?！@就來。故選B。cooks烹飪，一般現(xiàn)在時(shí)；is cooking烹飪，現(xiàn)在進(jìn)行時(shí)；will cook烹飪，一般將來時(shí)；cooked烹飪，一般過去時(shí)。cooks烹飪，一般現(xiàn)在時(shí)；is cooking烹飪，現(xiàn)在進(jìn)行時(shí)；will cook烹飪，一般將來時(shí)；cooked烹飪，一般過解析：B【詳解】句意：——媽媽在哪里？——她正在廚房做飯。2．B【詳解】句意：——媽媽在哪里？——她正在廚房做飯。wear穿；根據(jù)“I’ll have it changed immediately”可知在說話的時(shí)候“毛衣穿反”這個(gè)動(dòng)作正在進(jìn)行，用現(xiàn)在進(jìn)行時(shí)，結(jié)構(gòu)是：am/is/are + doing；主語是“You”，be動(dòng)詞用are?！?，天吶！我馬上把它換過來。wear穿；根據(jù)“I’ll have it changed immediately解析：B【詳解】句意：——Lena，我想今天早上你很匆忙?！叮靺?！我馬上把它換過來。s dad?—Oh, he ________ the flowers in the garden.A．waters B．is watering C．watered D．has watered20．Excuse me. I really need to go now. My children _____________for me at school.A．a(chǎn)re waiting B．waits C．wait D．waited21．Many children in South Sudan ________ the trouble of hunger at the moment.A．face B．faces C．is facing D．a(chǎn)re facing22．— Helen, how was your English petition on Monday?— I have no idea, I _________ for the result. I was told it would e out in two days.A．was waiting B．waited C．will wait D．a(chǎn)m waiting23．— Hi, Tom. I can’t find David anywhere. Do you know where he is?—Oh, he ________ for tomorrow’s exam at home.A．prepares B．is preparing C．has prepared D．prepared24．—Where is your mother, Kitty?—She ________ dinner in the kitchen.A．cooks B．cooked C．is cooking D．will cook25．—Lily, where is our father now? Go and get him for lunch. —Just a moment, please. Father ________ a phone call in his room.A．is making B．was making C．makes D．has made26．—Look out! Something ________ down from the tree.—Dear me! It’s too dangerous.A．falls B．fell C．is falling D．was falling27．— Dad, I can’t work out this math problem. Can you give me a hand?— Wait a moment. I ________ on the phone.A．a(chǎn)m talking B．will talk C．was talking D．have talked28．— Tom, what’s your sister doing?— She ________ her homework in the study.A．does B．will do C．did D．is doing29．— Tom, where is your little sister?—