三、Fill in the blanks with the proper form of the words given in brackets（10%）
41.The internet _______ (able) people to communicate more conveniently.
42.He is so busy that he only pays me ________ (occasion) visits.
43.The ___________ (innovate) of air travel during this century has made
the world seem smaller.
44.The great musician devoted himself__________ (entire) to music.
45.He’s involved in the __________ (organize) of a new club.
46.Many young girls see Liu Dehua as a (an) _________ (attraction) actor.
47.The new manager usually ___________ (entertainment) his staff once a month.
48.This professor is famous for his ___________ (academic) research.
49.We are surprised at his great__________ (improve) in English.
50.It is a (an) __________ (formal) occasion; you can just wear jeans and T-shirts.