`67,` He has worked in the bank since he left the college.
`->` Trước "since": thì hiện tại hoàn thành.
`->` Sau "since": thì quá khứ đơn.
`68,` Language learners should try different ways of learning words so as to find out the best way for themselves.
`->` Should + Vo
`->` So as to: để
`69,` Quoc Tu Giam was established in 1076.
`->` Câu bị động thì quá khứ đơn:
`->` S + was/ were + VpII + (by O)
`70,` She said that she was interested in the rice-cookinh contest.
`->` Lùi thì (is `->` was)
`->` Be interested in: thích.
