In recent years, learning Chinese____(become) popular among people around the world. Last month, I received an email from my cousin Jack in Canada. He said he was enthusiastic____Chinese, and asked 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.____（final） I selected a set of Chinese textbooks among ____(vary) similar ones. Then I went to a post office to have them delivered by air without delay. Several days later, I received Jack's email,____ (say) that he really appreciated the books I had sent. I'm very glad that Jack is beginning to learn Chinese just like many other____(foreign) abroad,____I know it may be an enjoyable challenge for him.