21、 The poet and            pianist is going to give us a talk this afternoon.
    A. a               B. the                   C. 不填        D. an
22、 —Waiter!
    —              
    —I can’t eat this. It’s too salty.
A. Yes, sir?           B. What?       C. All right?          D. Pardon?
23、 What I want to know is ______ he likes the gift given by us.
A. that             B. if              C. whether             D.不填