A．to discoverB．to be discoveredC．discoveredD．being disc……

填空题______(正如我们强调的那样) many times, serve the people is our first policy. (stress)

单项选择题Doctors say that exercise is important for health, but it ______ be regular exercise.

填空题Last night's TV news said that by then the death of the missing people______(未证实) yet. (prove)

单项选择题Not until he left his home ______ to know how important the family was for him.

单项选择题Galileo lived in the City of Pisa, ______there is a leaning tower about 180 feet______.