The stars are so hot that they___great light and heat---more than the hottest,brightest fire you can imagine
.According to some doctors, one of the ways to prevent us from growing old is to make sure that our brains get enough___.
.We are ____faced with the necessity to recognize that having more people implies a lower standard of living.
.Although many people view conflict as bad, conflict is sometimes useful _______ it forces people to test the relative merits of their attitudes and behaviors.
.— I phoned you at 7 yesterday evening but nobody answered. — Oh, I ________ my dog in the park then.
.Paris________ be a wonderful city but it’s not somewhere I’d like to live.