Stress can be extremely damaging to your health. Exercise, __________, can reduce its effects.
I regret _________ you that you can't ________ the game.
His health requires that he ________ to bed early.
I shall never forget the day ________ Liu Xiang won the gold medal, _________ has a great effect on my life.
The place ________ the bridge is supposed to be built should be _________ the cross-river traffic is the heaviest.
The factory produces half a million pairs of shoes every year, _________ are sold abroad.