51, You say, "Please keep quiet! Our teacher is coming."

42, You say, "I advise you to do sports more and watch TV less. Watching too much is harmful to your eyes."

43, You say, "Hung, unless you study harder, you won't pass any examinations."

54, You say, "This pool is not safe enough for us to do anything, please stay away."

55, You say, "You mustn't tease wild animals."

51. You say, '' Keep quiet,please. Our teacher is away for a few minutes.''

52. You say, '' You mustn't watch too much televion and should play any sports.''

53. You say, '' Hung, you must study hard enough.''