单项选择题

阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出能填入相应空白处的最佳选项。

One day a little boy comes into a shop and (41) the shop assistant,“I want (42) twelve exercise books of 6 cents each and pencils of 10 cents each. (43) is that altogether” The shop assistant writes these numbers down on (44) and thinks for (45) . Then she says,“1 dollar and 62 cents.”“If I gave (46) ten dollars, how much will I get (47) ”“You’ll get (48) for change. Here you are. Here are the things you want.”“ (49) , I don’t want to buy anything.”“ (50) boy looks at the piece of paper and says politely, “This is one of my homework. Thank you very much. Can I take it away” “What!”says the shop assistant angrily.