（20） Mr and Mrs Firth had a long courtship. They dated for nine years before they got married.
（21）After the scorpion affair the whole family tried in vain to get me to stop collecting animals and insects. They should have known that I wouldn’t stop collecting just because of one little scare .
（22） In the past，the world seemed to run in an orderly way. Now，however，everything seems to be in a state of turmoil .
（23） Monkeys are well known for their grooming habits；they spend hours carefully cleaning bits of dirt straw from their coats .
（24） Robert is considered an autocratic administrator because he makes decisions without seeking the opinions of others .
（25） Instead of complaining to me that you’re ailing，you should see a doctor to find out what’s wrong with you .
（26） Many people believe that only primitive societies have a special ceremony to celebrate the time when a child becomes an adult；however，anthropologists say that advanced cultures also have uberty rites .
（27） Doctors believe that smoking cigarettes is detrimental to your health. They also regard drinking as harmful .
（28） Sue has been blind from birth，but she did not let her handicap stop her from going to college .
（29） Rick spent all of his time playing sports instead of studying；as a result his reading ability has been handicapped. His mental development lags behind his physical development .
（30） Alice shouted into the cave calling for her brother，but the only sound she heard was the echo of her own voice bouncing off the stone walls .
（31） When the child moved to the city she frequently got lost if she went out alone. She could never remember which direction she had come from；she was unable to orient herself in her new surroundings .
（32） The singer’s performance was not very good； the notes he sang were often the wrong pitch —— sometimes they were too low and sometimes too high .
（33）The doctor said that if a person ate even one leaf of the hemlock plant，he would die，because the plant is a deadly poison.
（34） The murderer had developed a poison which could not be tasted or smelled when mixed with food. Because it was imperceptible，he was able to murder a number of people without being caught .
（35） “Since you are my best friend，and because I can trust you，I know I can be confidential with you. Listen carefully，because what I am going to tell you is a secret ，”said Henry .
（36） “I am able to oblige you，sir；I can give you the item you wanted so badly .”
（37） There are times when one wants to be surrounded by people，and there are times when one needs solitude .
（38） The man was so jealous of his wife that he would not allow her to talk to other men .[1][2][3][4]
