21. Fireworks exploded during _________ opening ceremony of _________ 2011 Asian Cup football tournament at Khalifa Stadium in Doha, capital of Qatar, Jan. 7, 2011.
A. the; a B. a; the C. a; a D. the; the
22. Low temperatures and freezing rain in some parts of China also pushed up _________ of agricultural products during the early weeks of 2011.
A. benefits B. interests C. welfares D. prices
