1．There is_______picture of _______elephant on_______ wall．
2．This is _______useful book．I've read it for _______hour．
3． _______elephant is much heavier than _______horse.
4． _______doctor told him to take _______medicine three times _______day．
5．Let's go out for_______walk．
6．It's too hot．Open _______door，please.
7．There is _______woman over there． _______woman is Meimei's mother．
8． _______sun rises in _______east．
9． _______Changjiang River is _______longest river in _______China．