Once harm ______ to the environment, it takes years to have the system recovered.
The most important _____ of his speech was that we should all work whole-heartedly for the people.
The climbers _____ their ambition by reaching the summit of the mountain.
I remember her face but I cannot _____ where I met her.
He has left his book here on _____, so that you can read it.
He has left his book here on _____, so that you can read it. 汇