20.His knowledge of language and international businesshim a lot in his work.

80.We have all learned a lot from the.

79.new products have been successfully produced.

78.Those scientists were conducting an experiment and expected a good.

77.Many newwill be opened up in the future for those with university education.

76.The population of the world is growing at a dangerous.

75.Those opinions are now out of.

74.I saw a traffic this morning.

73.It wasn＇t an accident. He did it on.

72.We still have tremendousto overcome before we achieve our goal.

71.I hope my teacher will take my recent illness intowhen judging my examination.