The old man _______  up late,but now he _________ up early.

Obviously, the advantage we take of solar energy is ________   enough.We have to work still harder.

I _____ it as a basic principle of the company that suppliers of raw materials should be given a fair price for their products.

Actually it was the passenger ________ the driver that caused the serious accident on the road.

Mr. Smith often goes to the park near his house to ____ the pressure of work.