1．That she hadn’t kept her ________ on her work resulted in the failure．
A．head B．heart C．brain D．mind
2．Many people have been ill from a strange disease these days，________ we’ve never heard of before．
A．it B．that C．one D．this
3．—Is China Daily ________ here at your book stall?
—Sorry，it has been sold out．
A．suitable B．available
C．precious D．convenient
