【正文】 結(jié)構(gòu)為am/is/are+動詞現(xiàn)在分詞，主語“The birds”是復(fù)數(shù)，be動詞用are，故選C。她正在打掃教室?？疾閯釉~時態(tài)?？疾闀r態(tài)。t seen Jack for a couple of days. —He ________ for the English speaking petition which will take place next week.A．will prepare B．is preparing C．has prepared D．was preparing3．Betty can’t join us in the game. She ________ the classroom.A．has cleaned B．was cleaning C．has cleaned D．is cleaning4．Listen! The birds ________ happily in the tree outside the window.A．sing B．sang C．a(chǎn)re singing D．were singing5．I must leave now. My brother ________ for me outside.A．waits B．waited C．is waiting D．was waiting6．—Where is John?—He is in the kitchen. He ________ the dishes now.A．will wash B．is washing C．washes D．washed7．— Tom, where is your little sister?— She _______ in the backyard now.A．is playing B．will play C．played D．plays8．—Tony, hurry up! We ________ for you now.—Just one minute.A．wait B．waited C．have waited D．a(chǎn)re waiting9．The zoo keeper is worried because the number of visitors ________ smaller and smaller.A．bee B．a(chǎn)re being C．is being D．have bee10．— What’s that noise, Sam?— My little brother ________ his toy car.A．played B．is playing C．plays D．was playing11．—Can Peter play games with us, Mrs. Hawking?—Wait a minute. He ________ a shower.A．is taking B．taken C．took D．was taking12．—Candy, could you please help me do the dishes?—Sorry, Mom. I ________ my homework.A．do B．did C．a(chǎn)m doing D．have done13．You’d better not disturb Kathy now as she ________ her speech for tomorrow’s meeting.A．is preparing B．will prepare C．was preparing D．has prepared14．— Lena, I guess you were in a hurry this morning. You ________ your sweater inside out.— Oh my god, I’ll have it changed immediately.A．wore B．a(chǎn)re wearing C．were wearing D．have worn15．—What’s the terrible noise?—The students ________ for a party.A．have prepared B．a(chǎn)re preparing C．prepare D．will prepare16．— Hurry up, Mary. The movie has already been on for ten minutes. —Wait a moment. I ________ some snacks in a shop.A．buy B．bought C．a(chǎn)m buying D．have bought17．—Mom, it’s so late. Why don’t you go to bed?—Your brother hasn’t e back yet. I ________ for him.A．wait B．a(chǎn)m waiting C．has waited D．waited18．—Where is Frank?—He _________ to music in his room.A．listens B．is listening C．listened D．was listening19．— Hello. May I speak to Laura, please?—Sorry, she39。根據(jù)“Tom, please give me a hand in moving the piano.”及語境可知解析：C【詳解】句意：——湯姆，請幫我搬一下鋼琴。選項(xiàng)A為一般將來時；選項(xiàng)B為現(xiàn)在進(jìn)行時；選項(xiàng)C為現(xiàn)在完成時；選項(xiàng)D為過去進(jìn)行時。她正在打掃教室?？疾楝F(xiàn)在進(jìn)行時。根據(jù)“I must leave now.”可知，我哥哥現(xiàn)在正在外面等我，時態(tài)是現(xiàn)在進(jìn)行時，結(jié)構(gòu)：am/is/are+動詞ing，主語My brother是第三人稱單數(shù)，故be動詞用is。will wash動詞的一般將來時形式；is washing動詞的現(xiàn)在進(jìn)行時形式；washes動詞的三單形式；washed動詞的過去式。故選A。9．C【詳解】句意：動物園管理員很擔(dān)心，因?yàn)橛慰蛿?shù)量越來越少。根據(jù)“What’s that noise, Sam?”判斷，此處應(yīng)該用現(xiàn)在進(jìn)行時，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。根據(jù)“Wait a minute.”可知，彼得現(xiàn)在正在洗澡，強(qiáng)調(diào)動作正在進(jìn)行，所以時態(tài)應(yīng)該用現(xiàn)在進(jìn)行時，結(jié)構(gòu)為：am/is/are + 動詞的現(xiàn)在分詞，主語He為第三人稱單數(shù)，be動詞用is?？疾閯釉~時態(tài)。故選A?？疾闀r態(tài)。16．C【詳解】句意：——快點(diǎn)，瑪麗，電影已經(jīng)開始十分鐘了。buy一般現(xiàn)在時；bought一般過去時；am buying現(xiàn)在進(jìn)行時；have bought現(xiàn)在完成時。為什么你還不睡？ ——你哥哥還沒有回來。故選B。考查