97. Lisa hopped on her bicycle and ______ as fast as she could through the dark narrow backstreets to get home after working the night shift.
(A) bounced
(B) commuted
(C) tumbled
(D) pedaled
168. Food shortages are one of the main causes of ______ nutrition among children in developing countries.
(A) distinctive
(B) vigorous
(C) inadequate
(D) abundant
223. Global warming has been a _____ problem; a number of countries are increasing their efforts to deal with climate change. But we still have a long way to go.
(A) crisp
(B) stubborn
(C) gentle
(D) bare