单项选择题 In labs around the world, bad bugs are undergoing the ultimate rehabilitation, being （）from life-threatening viruses and bacteria into lifesaving therapeutic agents.

单项选择题 They found that the positive thinkers sold 37 percent more insurance than did the（）thinkers.

单项选择题 It is possible to predict how much energy and water a building will consume, how much （）will be needed.