《管子·山权数(轻重八)》:“汤七年旱,禹五年水,民之无粮有卖子者。汤以庄山之金铸币,而赎民之无粮卖子者;禹以历山之金铸币,而赎民之无粮卖子者。”下列对圣贤发明货币的传说的认识正确的是( )
We often use computers to ______________.
Shanghai is ______the east of China, and Japan is _______the east of China.
—_____________ do you go back to your hometown ? —Twice a year
An ________ boy came to our class yesterday.
Some families raise cows, and _________ grow wheat.