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46. They often like playing soccer and swimming in their free time. 

47. Soccer is the most popular team sport in Vietnam.

48. They play soccer at school, in parks or on the streets.

49. They don't need to swim with anybody else.

50. Yes, they can. 

("Can" là động từ khuyết thiếu, "students" thành "they" và cấu trúc "S+can+ V nguyên thể).