[跟踪训练]
在空格处填入适当的词(1个单词)或所给词的正确形式
1．It really (change) what I’m doing.
2．We have the interest of 500,000 (customer) to think of.
3．We have over 30 beautiful designs (select) from.
4．His grandchildren (afford) him his greatest pleasure before he died.
5．My department had a healthy interest in keeping (expense) down.
6．This new model is high quality and is not expensive either.
7．I hear she’s going to sell and move to the city.
8．The driver said that he was told to pay cash and not to identify himself.
9．I gave him some books in return his assistance.
