He set up in business（）his own and was very successful.
A、inC
「句意」他独自一人开始经商，并且做得很成功。
「难点」onone‘sown是个常用的介词词组，意为“独自”;ofone’sown表示“某人自己的(东西)”，如：Ihaveaflatofmyown.我自己有套房子。
The small mountain village was （）by the snow for more than one month.
It was recommended that passengers _____ smoke during the flight.
John'sscoreonthetestisthehighestintheclass;he____lastnight.
Breadandbutter（）likedbyWesterners.
Toobtainasatisfactoryresult，onemustapplytwo（）ofpaintonacleansurface.
