Module 6 Unexplained Mysteries of Natural Section Grammar.用下列情态动词完成句子1Mr White _ have arrived at 8：30 for the meeting, but he didnt turn up.2Tom, I have cleaned the room for you.Thanks. You _ not have done it. I can manage it.3He _ not have been more than 20 years old, because he just graduated from school.4He _ have finished his work, but Im not sure.5I _ have come to the party yesterday, but I had an unexpected visitor.6He _have completed his work; otherwise, he wouldnt be enjoying himself by the seaside.答案：1.should2.need3.can4.may/might5would6.must.用括号内所给动词的适当形式填空1You should _ (hand in) your composition yesterday.2The dinosaurs may _ (stop) evolving already.3He may _ (come) soon; Im not sure.4There must _ (be) dinosaurs today living in other galaxies.5In the past a huge meteorite might _ (hit) all the dinosaurs.6You must _ (know) everything now.7It cant _ (be) him; he doesnt wear glasses.8If only I _ (follow) your advice.9He suggested that the meeting should not _ (put off)答案：1.have handed in2.have stopped3.come4be5.have hit6.have known7.be8.had followed9.be put off.单句改错1What do you suppose has happened to him?I dont know. He should have got lost._2Jerry doesnt mind lending you his bike.He couldnt. I have borrowed Marys._3If he had been here, he can have given us some help._4I didnt hear the phone. I should have been asleep._5He knew nothing about the book. He mustnt have read it before._6Liu Dong was in Jinan yesterday，so he shouldnt have come._7Did Mary come to the party?I dont know. She must have come while I was out._8He can have finished his work; otherwise, he wouldnt be enjoying music in his study._9She is two hours late. What may happen to her?_10Everyone in my class passed the exam. It mustnt have been difficult._答案：1.shouldmay/might2.couldntneednt3cancould/might/would4.shouldmust5mustntcouldnt6.shouldntcouldnt7mustmay/might8.canmust9may happencan have happened10mustntcant.完形填空It was July 1976. An unmanned spaceship, Viking One, had arrived at Mars. On July 20th, the spaceship _1_. Part of it continued toward a landing on the planet. It fell _2_ through the late afternoon Mars sky.Forty kilometers above the planet, the thin _3_ began to slow its fall. Six kilometers above the planet a big parachute(降落伞) opened. The landing craft fell more slowly. Then, three rocket engines _4_. And the landing craft set down _5_ on the surface. _6_ in the Viking One Lander immediately sent a message to the earth. It said, “I am here. I am down safely. I am beginning my work.”The message _7_ at the speed of light. It took twenty minutes to reach the earth, more than three hundred and twenty million kilometers _8_. Scientists and engineers at the control center _9_.Moments later, television receiver in the control center began to _10_ the first picture from Viking One. People at the center could see the feet of the landing craft sitting firmly on the _11_ soil of Mars. Those pictures were our first _12_ look at the planet. They showed a red surface, full of rocks, with no sign of _13_. It was our first look at a planet that is full of surprises, mysteries and promise. Viking One was launched toward Mars in August, 1975. The spaceship had two _14_：an orbiter(轨道飞行器) and a lander(着陆器). The orbiter would circle _15_ Mars. It would take pictures of Mars surface. It would _16_ the atmosphere.The _17_ would go down to the surface. It would carry _18_ to dig up and study soil and _19_.It also would report about any evidence of life on the planet. The lander would send this _20_ to the orbiter and then back to the earth.1A. separated B. appearedC. worked D. started2A. correctly B. slowlyC. quickly D. directly3A. air B. universeC. space D. atmosphere4A. fired B. fellC. opened D. floated5A. heavily B. softlyC. suddenly D. immediately6A. A computer B. A rocketC. A pilot D. An astronaut7A. spread B. traveledC. shot D. moved8A. far B. longC. distant D. away9A. shouted B. watchedC. cheered D. welcomed10A. make B. takeC. show D. search11A. red B. brownC. gray D. b