21. My friend Mary is _________beautiful girl, _________girl everyone likes to work with.
A . a , a B . a , the C . the, a D. the , the
22. The government has taken some measures to solve the shortage of electricity , but it may be some time _________the situation improves.
A. since B. when C. before D. unless
23. The chairman, together with the older leaders, stood on the Tian’anmen Tower , _________ the parades _________along the Chang’an Avenue.
A. watched, being marched B. watching , marching
C. watches, marching D. matching, being marched
