$5.$ You should choose your travel provider on the basis of their eco principles and practices before your departure. (SB be advised to do STH ≈ SB should do STH)
$6.$ She asked her sister if she would do it for her. (Câu gián tiếp)
$7.$ His mother is not as tall as his father (So sánh hơn kém → so sánh không ngang bằng)
$8.$ He told his girlfriend that he had bought a ring (Câu gián tiếp lùi thì)
$9.$ The girl looked very upset because her electronic dictionary broke down. (Liên từ because để nối câu)
$10.$ If there weren't any air on the planet; people, animal, and plants couldn't live (Câu điều kiện loại 2)
`text{Chúc bạn học tốt!}`
