阅读理解。 One day, a little boy comes into a shop and says to the shop assistant, 'I want to buy twelve exercise books of 6 cents each and nine pencils of 10 cents each. How much is that altogether (总共)?' The shop assistant writes these numbers down on a piece of paper and thinks for a minute. Then she says. 'I dollars 62 cents.''If I give you ten dollars. How much money will I get back?''You will get 8 dollars 38 cents for change . Here you are. These are the things you want.' 'No. thank you, I don't want to buy anything.'The boy looks at the piece of paper and says politely,' This is my math homework. Thank you very much. Can I take it away?'' 1. The story happens ________. A. in a shop B. at a mall C. in a supermarket D. at school 2. The little boy comes to the shop for ________. A. nine pencils B. some books C. nothing D. his homework 3. The little boy is ________. A. bad B. naughty but clever C. stupid (愚蠢) D. hard-working 4. At last the shop assistant must be ________. A. excited B. happy C. angry D. surprised 5. The word 'change' in the second passage means ________. A. 零钱 B. 交换 C. 改变 D. 金钱