13.How could students _____ energy?(save) (2.5 Điểm) 14.Students _________ money for a charity at present.(raise) (2.5 Điểm) 15.There ________ forty students in my class.(be) (2.5 Điểm) 16.My sister is old enough _____ in her class. (be) (2.5 Điểm) 17.You should ______ tea farms in Moc Chau Highland. (visit) (2.5 Điểm) 18.I _____ in Ho Chi Minh city since 2008. (live) (2.5 Điểm)

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