There seemed nothing else to do but ______a doctor

There must be a better way to teach our students__________value of __________life than just inviting an old professor to give aboring lecture.

The documentary Under the Dome by Chai Jing tells us to do ______ to stop ______ our environment.

Your trousers ____dirty， you must have _____washed.

I can two birds the tree and some apples the tree.