【正文】 16．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．—What’s the terrible noise?—The students ________ for a party.A．have prepared B．a(chǎn)re preparing C．prepare D．will prepare18．Listen! Someone __________ in the next room.A．sings B．sang C．was singing D．is singing19．— 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 bought20．—Hi, Daming. What are you up to?—I ________ a project about family history.A．do B．did C．a(chǎn)m doing D．was doing21．— Tom, what’s your sister doing?— She ________ her homework in the study.A．does B．will do C．did D．is doing22．You had better not go this way. The workers _________ the road.A．have repaired B．a(chǎn)re repairing C．repaired D．will repair23．—What is your mother doing, Linda? —She ________ dinner in the kitchen now.A．is cooking B．was cooking C．cooks D．cooking24．My father ________ Beijing next week.A．leaves for B．is leaving for C．left D．leaves25．I can’t hear you. I ______ to an English speech.A．a(chǎn)m listening B．listen C．was listening26．Xifeng Street is closed today because workers _______ some repairs.A．make B．made C．a(chǎn)re making D．were making27．— May I speak to Mr. Brown?— I am sorry. He ________ an important meeting in his office now.A．has B．had C．is having D．will have28．—Tina, let’s go out for shopping.—Sorry, Amy. I __________ my homework.A．do B．a(chǎn)m doing C．did29．—What’s that noise, Mike?—My little sister ________ with her toy car now.A．plays B．played C．will play D．is playing30．—Ethan, let’s go to play basketball, shall we?—Sorry, I can’t. I ________Yao Ming’s game. Would you mind going later?A．watch B．have watched C．a(chǎn)m watching D．was watching31．—Mary, may I use your ipad for an hour?—Sorry. I ________ on it.A．work B．a(chǎn)m working C．have worked D．worked32．—Where’s Nick?—He ________ classes at school.A．had B．will have C．is having D．was having33．My grandma ________ the old photos. There is a big smile on her face.A．enjoys B．enjoyed C．will enjoy D．is enjoying34．— Amy, can you answer the door? I ________ the room.— I’m ing, Mum.A．clean B．cleaned C．a(chǎn)m cleaning D．have cleaned35．—Bob, can you take the dog for a walk?—Sorry, Dad. I ________ an online class.A．take B．took C．a(chǎn)m taking D．have taken36．My oil ________. I must go to the gas station before there is none left.A．has run out B．is running out C．has been run out D．is being run out37．Betty can’t join us in the card game. She ________ the classroom.A．has cleaned B．was cleaning C．has cleaned D．is cleaning38．—Where is your father, David?—He ________ the car in the garden.A．will wash B．washed C．is washing D．was washing39．The zoo keeper is worried because the number of visitors ________ smaller and smaller.A．b