21．— I was late for work this morning.
— _________. You started early, didn’t you?
A．Why not? B．So what? C．How come? D．Never mind.
22．I remember seeing this kind of _______ product in _______ city of Shanghai, which is known as _______ Paris of the East.
A．the; the; the B．/; the; the C．the; /; the D．the; a; /
23．In Australia there are over 140 species of snakes, many of ______ are extremely dangerous.
A．which B．that C．them D．those
