21． our teacher gave us !
A．How a good advice B．How good advice
C．What a good advice D．What good advice
22．—Which do you like , tea or coffee ?
— .
A．I like it very much B．Yes , I like coffee
C．Tea , please D．Thank you
23．It was three o’clock we finished the work .
A．where B．by which C．when D．since
