han 100 million people live in the beautifulprovince, __________

Jack ______ live with his grandparents, but he doesn’t now.

Mary_______ my letter, otherwise she would have gone to the concert.

(2013·高考新课标全国卷Ⅰ)There’s no way of knowing why one man makes an important discovery________another man，also intelligent，fails

Advertisements（广告）are like air-they are_______.