56．We had a _________ about how to prevent A／H1N1 flu in class yesterday．

55．Alice is a nice girl and never says anything _________ about others．

54．Kunming is famous for its _________ climate．

53．_________，I caught the last bus，so I didn't have to walk home．

52．We all know that _________is between June and August．

B．请根据句意从方框中选择合适的词，并用其适当形式填空，使句子通顺。（每小题1分，共7分）

please   kind    lucky    discuss   you   sixty   knife

51．I have just moved to a new house．Please write down my new _________ --18 Park Road．

50．Don't _________（run quickly）．There is plenty of time left．

49．My cousin is studying in Beijing，so we _________（not very often）see each other now．

48．We should never do anything _________（违反）the law．

47．It is not safe for such a small child to swim _________（单独）in the river．