When _______ comes to saving energy, big changes start with small steps, like turning off the lights.
It is the test system, _____ the teachers, that is to blame for the heavy burden of middle school students nowadays.
With the help of his friends, he has _____a good business over the years.
Although it is ________ to watch programs on TV sometimes, I think people shouldn’t spend all the time watching it.
Modern teaching equipment as well as some computers _______ to the village school last week.
I have reached a point in my life ______ I am supposed to make decisions of my own.