21. For him ______ stage is just _____ means of making a living.
A. a; a B. the; a C. the; the D. a; the
22. Marriage is, first of all, a ________ which must be governed by justice.
A. contract B. contraction C. contact D. contrast
23. The policemen in ______ clothes are searching for the pickpockets in the railway station.
A. normal B. usual C. common D. ordinary
