请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
21. ______ World Food Programme has organized a number of programmes, which target people most at ______ risk and people stand at ______ crossroads, such as babies, pregnant women and ______ elderly.
A. /; the; the; / B. The; /; the; the C. The;/; the; / D. /; /; a; the
22. ______ absent from class for a whole week, the teacher decided to give him a three days’ suspension ______ school.
A. Having been; off B. Tom hav ing been; from
C. Because of being; by D. Tom had been; away from
23. This is a simple idea, but ______ which is hard to put into practice.
A. / B. the one C. one D. that
24. The Roma originally lived in northern India in ______ is now Pakistan, and later tried in vain to settle down ______ they could live and trade peacefully.
A. where; where B. which; in wh
