我进教室的时候学生们正在讨论物理竞赛。(discuss)
The students when I came into the classroom.
I like reading because it can (增长)our knowledge.
Skating seems to be Mary's only (爱好)in her life.
I'm (自豪的) to say that we have made the right decision.
My aunt has gone (某处)out of town to buy some flowers.
The old engineer made a contribution to developing the (西部的)part of China.