There are nine______ students at Green High School. Five _____ of them walk to school.
---How long ________ you _______ the book ? --- For only a week.
--- It’s said that the plane MH370 from Malaysia got lost. --- ________ sad news.
--- ______ I take some photos in the hall ? ---No, you ________.
________Switzerland (瑞士) is very small , _______it is the land of watch and it is very rich.
---At present, one of the best ways to study is working in groups. ---More chances _______ to students to learn from each other.