单项选择题
Everything（）if Albert hadn't called the fire brigade.
A.will be destroyed B.will have been destroyed C.would be destroyed D.would have been destroyed
单项选择题 If the man（）succeed，he must work as hard as he can.
单项选择题 If he was fitter, he（）live longer.
单项选择题 If there were life on Mars, such life forms（）unable to survive on earth
