21．As ____unemployment is very high at the moment, it’s very difficult for people to find ___work.
A．the ; / B．/; / C．the; / D．an ; the
22．Dr. Peter Spence, ____headmaster of the school. told us, “A fifth of pupils here go on to study at Oxford and Cambridge.”
A．an B．/ C．the D．a
23．Meeting my uncle after all these years was____ unforgettable moment , ____moment I will always treasure.
A．a ; a B．an ; the C．an; a D．/; a
