The rich only_________ themselves in making money and had no eye for the needs and welfare of their workers．

Choosing what ______is no longer as easy as itonce was, for people’s eating habits are changing,

Scientists have found it seems _______animals andhumans are much alike than we thought

Scientists are convinced ________ the positive effectof laughter ________ physical and mental health.

is ____ as a free dinner in this world, as thesaying goes, “No pains, no gains”