When taking drugs, it is the __________________ who should be especially watchful, for chugs usually aren’t tested on these groups of people.

A．Watching traditional plays.
B．Visiting the magnificent libraries.
C．Boating on the river.
D．Cycling in narrow streets.

A．He left his notes at home.
B．He doesn’t know where his notes are.
C．He doesn’t want to lend his notes to the woman.
D．He agrees to lend her his notes.