13. (A). You can’t buy the boat.

　　(B). The boat is very expensive.

　　(C). It isn’t a sailboat.

　　(D). I wasn’t able to sell the boat.

　　14. (A). I frosted the cake when it was ready.

　　(B). I froze the dessert after we had dinner.

　　(C). I had already put the steak in the refrigerator.

　　(D). I cooked for the posters later on.

　　答案：

　　AA

　　音频文本:

　　13. The boat isn’t for sale.

　　14. After the cake had cooled, I put frosting on it.