1. 老师昨天要学生们放学以后留下来。 Yesterday the teacher the students in the classroom after school. 2. 你必须及时把图书归还到图书室。 You must return the book to the library . 3. 来自澳大利亚的文尼遇到许多困难，但他从不放弃。 Vinny, from Australia, so many difficulties , but he never gave up. 4. 天津的变化使我们感到惊讶。 We are the changes in Tianjin. 5. 一周又一周，一个想法在他的头脑里逐渐形成。 Week after week, an idea slowly in his mind.
