题目内容：

In recent years , learning Chinese___ (become)popular among people around the world .Last month , I ____(receive) an emial from my cousin Jack in Canada .He said he was enthusiastic about Chinas , and asked me to find me to find him some books___ (intend) for Chinese beginners. I was very pleased to do      a favor. So I went from one bookstore to      , hoping to find something suitable for him.      I selected a set of Chinese textbooks among a variety of similar ones. Then I went to a post office to have them      (deliver) by air without delay. Several days later, I received Jack’s email,      (say) that he really appreciated the books I     (send). I’m very glad that Jack is beginning to learn Chinese just like many other foreigners abroad,      I know it may be an enjoyable challenge for him.