My home is about ________ from my school.
______ Sunday, rather than ______ TV all day, I preferred ______.
Legend has ______ that CaoCao, King of Wei kingdom in the Three Kingdoms period, built 72 tombs to confuse tomb diggers.
It is high time we ______ awareness of environmental protection.
How can they learn anything useful ______ they spend all their spare time playing online games?
______ is it that metals plays such an important part in our daily life?