—Excuse me,could you tell me________a book about science?—Sure.They are on the second floor.
I'mnothungrybecauseIhave_______hadlunch.
You____touchanelectricfire.It'sdangerous.
—_______.Whereisthebank? —It'sovertherebythepostoffice.
TheGreatWallofChinais_______wallintheworld.
Thinkofanumber,_______don'ttellmewhatitis.