问题详情：
Many Chinese students studying abroad like to stay with host families to learn their language and culture. Nowadays, many Shanghai white-collar workers have received native English-speaking international students as their host families, too, in order to learn English from them.
It is usually free for foreign students to stay in a host family in Shanghai, but he/she must take up the 36 (responsible) of teaching English to at least one certain member of the family. Miss Li has always worried about her 37 (limit) English. “I never knew what to say to an English-speaking person,” she said. She has taken a number of English courses, but none has proved to be 38 (use). Last year, she saw an 39 (advertise) recruiting (征募) host families for foreign students, and that was 40 Carey (from Chicago, US) came to her home. Carey is actually not a student, but a manager. She stays in Li’s apartment for free, 41 she has to teach Li oral English for one hour every day. “She could hardly speak Chinese at the beginning, and we had to guess 42 each other meant through gestures,” said Li.
Two months later, they could talk to each other 43 gesticulating (做手势). Now, Li can communicate with any English-speaking person freely. About one hundred Shanghai families have received foreign boarding students and the figure 44 (rise). However, foreign boarding students can only help 45 (improve) oral English, but not examination skills.
【回答】
onsibility 37limited 38useful39advertisement 40 how41 but 42 what 43 without
rising 45. (To) improve
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