21 To his great surprise, John was elected___ chairman of _____ Students’Union.
A. a; a B. a; the c. the; the D. /; the
22. Quite a few problems_____ after the new examination system was introduced, and the number of students in this school _____by 5% Last year.
A. arose; raised B. arose; rose C. rose; raised D. raised; rose
