选用方框内所给词的适当形式，完成短文。（每词限用一次）

One day, a little boy came into a shop. Heto the shop assistant(售货员) and said, "I'd like twelve exercise books of six cents each and nine pencils of ten cents each. How much are they?" The shop assistant wrote thesedown on a piece of paper and thought for a minute. Then she answered, "$1.62."

"If I give you $10, how much money will I get back?"

"You will get $8.38 for change. Here you are. Thesethe things you want."

"No, thanks. In fact, I don't need to buy anything. This ismath homework." The boy looked at the piece of paper and asked, "Can I take it away?"