When I was in the middle school, I was good at many subjects____(除了) English. It was a little difficult for me and I often made____(错误) in the test. I felt very sad.

    Luckily, my English teacher Miss Li was ____（相当地）kind. She advised me to buy a dictionary and____(提议，提出) to help me solve____(主要的，基础的) problems. Miss Li said that I ____(应该) speak English aloud and read ____(大量，众多) of English books. With her help, my English improved____(迅速地,快地). It was much____(更简单) for me to remember the words than before. And I became one of the actresses in the school English show at ____(终于，最后).

    I was thankful to my dear English teacher, Miss Li.

如图，从边长为（a+4）cm的正方形纸片中剪去一个边长为（a+1）cm的正方形（a＞1），剩余部分沿虚线又剪拼成一个矩形（不重叠无缝隙），则矩形的面积为（    ）