在你离开教室之前,确保窗户都关好。
the windows are closed before you leave the classroom.
Changes of price in the 1990s the beginning of the fast development age of TV(标志)
Good chances always hide around us,waiting for careful people to find them.(某处)
Mr.Li is to us how to organize our ideas according to the type of writing (解释)
Some young students like books better than paper books (电子的)
We often borrow novels and from our school library (杂志)