根据上下文在空白处填入一个适当的内容（不多于三个单词）或括号内提供单词的正确形式。
Many Chinese students studying abroad like to stay with host families to learn their language and culture. Nowadays, many Shanghai white­collar workers have received native English­speaking___(nation) students as their host families, too, in order to learn English from them.
It is usually free for a foreign student to stay in a host family in Shanghai, but he/she must take___the responsibility of teaching English to at least one certain member of the family. Miss Li has always worried about her____(limit) English. “I never knew what to say to an English­speaking person，” she said. She has taken a number of English courses, but____has proved to be useful. Last year, she saw____advertisement recruiting (征募) host families for foreign students, and that was how Carey (from Chicago, U．S.) came to her home. Carey is actually not a student, but a____(manage). She stays in Li's apartment for free，____has to teach Li oral English for an hour every day. “She could hardly speak Chinese at the beginning, and we had to guess____each other meant through gestures，” said Li.
Two months later, they could talk to each other___gesticulating. Now, Li can communicate with any English­speaking person freely. About 100 Shanghai families have received foreign boarding students, and the figure__(rise). However, foreign boarding students can not only help improve oral English, but examination skills.