Though he failed in the experiment again and again, he didn’t______, and at last, he made it.
We shouldn't complain about being poor; many families are even ______.
The most serious problem we are facing now is how to ______ all the pollution.
In his spare time, he often listens to music and watches films to _______ himself.
The global financial crisis, ______ started in the USA in 2008, affects almost every country, especially some developed countries.
——What do you think of Yuan Longping? ——____ man of ____ great achievement.