It’s one’s bad habits, rather than a certain natural disaster,one’s longevity (长寿)for most of the time.

pity! I _____ in London for threemore days, but something urgent needed to be dealt with back in Beijing.

He insisted that the earth ________ around the sun

(2013·青岛一模)Scientists are still wondering ________ the Egyptians built the pyramids so long ago.

have you been a League member— Since the second month I came to this class.