【正文】 aited 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．—May I speak to Mr. Brown? —I am sorry. He _______ an important meeting in his office at the moment.A．has B．had C．is having D．will have13．— Where are the officers? — Look! They ________ the elephant in the palace now.A．touched B．will touch C．touch D．a(chǎn)re touching14．—Peter, please be quiet. Your brother ________ on the phone.—No problem.A．records B．recorded C．was recording D．is recording15．—May I use your puter? —Sorry, I ________ on it.A．work B．worked C．have worked D．a(chǎn)m working16．Ladies and gentlemen, please remain in your seats, fasten your seat belt and bring your seat back. The plane________.A．takes off B．is taking off C．has taken off D．took off17．—Yesterday I received a letter from .—You did? I hear he________for America next year.A．has left B．leaves C．left D．is leaving18．—Hurry up!—One moment. I ________ my s.A．reading B．a(chǎn)m reading C．was reading D．have read19．—Mary, let39。考查動詞時態(tài)?？疾楝F(xiàn)在進行時。故選B。根據(jù)前句“The zoo keeper is worried”的語境可知，后句動作應(yīng)是解析：C【詳解】句意：動物園管理員很擔心，因為游客數(shù)量越來越少。12．C【詳解】句意：——我能和布朗先生通電話嗎？——很抱歉，他現(xiàn)在正在辦公室召開重要的會議?！獩]問題。takes off動詞三單；is taking off現(xiàn)在進行時；has taken of解析：B【詳解】句意：女士們，先生們，請留在座位上，系好安全帶，請將座椅靠背調(diào)整好。18．B【詳解】句意：——趕緊。 ——現(xiàn)在不行，我在幫我弟弟大衛(wèi)學數(shù)學?？疾楝F(xiàn)在進行時?？疾闀r態(tài)辨析。故選B。28．C【詳解】句意：——當心！有東西從樹上掉下來。根據(jù)“Look”可知現(xiàn)在正在跳舞，用現(xiàn)在進行時，其結(jié)構(gòu)為be doing?？疾闀r態(tài)。根據(jù)時間狀語at the moment，可知句子時態(tài)用現(xiàn)在進行時，其結(jié)構(gòu)為be+動詞的現(xiàn)在分詞，主語Many children是復數(shù)，be動詞用are，face的現(xiàn)在分詞是facing；故選D。36．B【詳解】句意：現(xiàn)在是下午4點。 ——對此我很抱歉。故選B。我必須在沒油之前趕到加油站?？疾閯釉~時態(tài)。根據(jù)“can you take the dog for a walk?”以及回答“Sorry, Dad解析：C【詳解】句意：——鮑勃，你能去遛遛狗嗎？——對不起，爸爸?？疾楝F(xiàn)在進行時態(tài)。我正在用它工作。根據(jù)“Look”可知現(xiàn)在正在跳舞，用現(xiàn)在進行時，其結(jié)構(gòu)為be doing。解析：C【詳解】句意：西峰街今天關(guān)閉，因為工人正在進行一些維修工作?？疾闀r態(tài)。我們一定會贏。now現(xiàn)在，是現(xiàn)在進行時的標志，需用be doing結(jié)構(gòu)；主語students復數(shù)人稱，be動詞用are，故選C。 ——現(xiàn)在不行，我在幫我弟弟大衛(wèi)學數(shù)學?？疾闀r態(tài)。故選D。look“看”用于提醒，后面的句子需用現(xiàn)在進行時“be doing”結(jié)構(gòu)。根據(jù)“Wait a minute.”可知，彼得現(xiàn)在正在洗澡，強調(diào)動作正在進行，所以時解析：A【詳解】句意：——霍金夫人，彼得可以和我們一起玩游戲嗎？ ——等一會兒，他正在洗澡。考查現(xiàn)在進行時。解析：B【詳解】句意：——你好，我可以和吉姆講話嗎？——對不起，他正在開一個重要的會。句中“Listen”是現(xiàn)在進行時態(tài)的標志詞，其結(jié)構(gòu)為am/is/are+動詞現(xiàn)在分詞，主語“The birds”是復數(shù)，be動詞解析：C【詳解】句意：聽!鳥兒在窗外的樹上快樂地歌唱?？疾閯釉~時態(tài)。s go to the cinema. There’s a new movie called Avengers IV. —Not now, I _____________ my brother David with his math.A．help B．helped C．a(chǎn)m helping D．have helped20．Be quiet, please. They _________ a meeting now.A．have B．had C．a(chǎn)re having D．were having21．—I can’t find David. Where is he?— He________ for tomorrow’s petition at home.A．prepares B．is preparing C．has prepared D．prepared22．—Has your aunt finished writing her novel?—Not yet. She ________ it these days.A．wrote B．w