As we know, penicillin became the greatest drug of the 20th century, ______ millions of lives.

单项选择（每题1分）She opened the window, _____ in some fresh air.

I still remember ______ to the Famen Temple and what I saw there. 

—I’m considering     to Qingdao by air for my holiday.—Why not try     by ship for a change?

Mary , _______ for her healthy lifestyle , was pictured on the front cover of Life Style magazine .