1.Elizabeth found that she was not right for the job and she had to s        for a living. 
答案:struggle
2.He is an e    student from Britain. 
答案:exchange
3.We accepted their c    to a baseball game. 
答案:challenge
4.He d    the rest of his life to his art. 
答案:devoted
5.The meeting is going to be a lot of    (额外的)work. 
答案:extra
6.Children should be given           (鼓励)as much as possible. 
答案:encouragement
7.He is a businessman and his main goal is to     (赚钱) money. 
答案:earn