Đáp án:
`1.` He came late because of the darkness.
`2.` I can’t study because of the noise.
`3.` I can’t sleep because of the hot weather.
`4.` He left school because of his hard life.
`5.` Mary didn’t go to school yesterday because of her sickness.
`6.` She went to bed early because of her tired.
`7.` I like him because of his father kindness.
`8.` I can eat these fruits because of their green color.
`9.` I couldn’t do the test because of it difficulty.
`10.` The train came late because of the rain.
`11.` Ann didn’t go to the circus with Betty because of her bad cold.
`12.` John succeeded in his exam because of his hard and methodically in work.
`13.` Margaret stayed home because her mother sickness.
`14.` All the teachers love him because of his well conduct.
`15.` I couldn’t read the letter because of darkness.
`16.` Because the traffic lights turned red we stopped our car.
`17.` The plane couldn’t take off because the weather was bad.
`18.` Because the weather rained heavily, I came late to the school anniversary.
`19.` Rice plants grow well becauseof the warm and damp climate.
`20.` He couldn’t drive fast because of the crowdedness and narrowness street.