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)