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资源简介：21. When he was out of _______ work, he was involved in crimes of violence and was put in ______ prison at last.
A. the; the B. /; / C. a; / D. /; the
22. ---We have reached the stage _____ we have to give up the experiment.
--- I’m sorry to hear that.
A. where B. when C. why D. which
23. _________ of the soil __________ away by the flood last night.
A. Three-fifth; was washed B. Three-fifth; were washed
C. Three-fifths; was washed D. Three-fifths; were washed
24. --- How long do you think the party will _____?
--- About four hours.
A. keep B. stay C. last D. remain
