1.Among five students,Mary is the tallest.
2.He hid the letter in the draw so that no one could read it.
3.If I brought my camera.so I could take a photo with you now.
4.City centers are not as safe as they were 20 years ago.
5.Saigon was said to be discovered in the Middle and North of Vietnam in early 1700s.
6.It's a pity that the flight is cancelled due to the bad weather.
7.If there were an earthquake on the event, you musn't go paniking.
8.Email is a good way for people to communicate,isn't it?
9.bạn chưa cho từ gợi ý để viết lại:)))