单项选择题
Nobody knows how long and how seriously the shakiness（不稳定） of big businesses will （） down the economy.
A.put B.settle C.drag D.knock
单项选择题 I tried very hard to persuade him to join our group but I met with a flat（）
单项选择题 Our department（）courses in several foreign languages.
单项选择题 She had clearly no（）of doing any work, although she was very well paid.
