He set up in business（）his own and was very successful.
C
「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。
You____that letter to James. However ， you didn't.
LastMarchthe__________ofa19thcenturycargoshipwasfoundbyanunderwaterarchaeologicalteam.
_____ regular training in nursing, she could hardly cope with the work at first.
_____ at in this way, the situation doesn ’t seem so desperate.
I was to have made a speech if _____.