39.I don＇t know the reasonMichael didn＇t come yesterday.

86.It was such a hot day that everyoneswimming in the river.

85.Once a decision is made, it must be firmly.

84.They have done things that they ought.

83.He has planned tosome money every month so that he can buy a house in the future.

82.People in that district use oil lamps, for there is no gas or electricity.

81.We should value the rich legacy of literature which the old generation hasto us.

80.I didn＇t see him at the meeting yesterday afternoon. Heit.

79.! That step is not safe!

78.You me because I didn＇t say that.

77.Which door does this keyto?