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`31 . ` B 

- Thông tin : Many adults learn English because it is useful for their work

` 32 . ` B

- Thông tin :  Every year people in many countries learn English. Some of them are young children. Others are teenagers. Many are adults , từ câu văn này ta có thể thấy độ phổ biến của Tiếng Anh trên toàn thế giới ` -> `  Chọn B

` 33 . `  A

- Thông tin :  In England, America, or Australia, many boys and girls study their native language, which is English, mathematics, and another language, perhaps French, or German or Spanish

` 34 . ` D

- Thông tin : Most people must work hard to learn another language

` 35 . `  C

- Thông tin : Many boys and girls learn English at school because it is one of their subjects