①上学期我物理和数学学得都很吃力。
I a really my physics and math last term.
②他认为你不该在教室里吸烟。
He doesn't think you smoke in the classroom.
③旅行能开拓我对外面世界的视野。
Traveling can my eyes the outside world.
④我的历史老师说如果我能更加努力的话，我在历史学科上会做得更好。
My history teacher said I could in history if I worked hard.
⑤他到达机场时，飞机起飞了。
The plane when he at the airport.
