完成句子

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.