75．火山爆发是绝妙的奇观。

　 The eruption of volcanoes was an ­­­­________ _________ sight.

74．在使用电器设备时你可以把它开着。如果不用就把它关掉。

　 It’s OK to leave an ___ appliance on so ___ as you are using it-if not, turn it off.

73．他使劲地按住伤口，使血流得慢些，一直等到警察和救护车到来。

　 He slowed the bleeding by applying ________ to the wounds until the police and ___________ arrived.

72．新的环境把我弄得心烦意乱的，由于缺乏新鲜空气，我感到受不了。

　 Confused by the new __________, I was hit by the lack of ________ air.

71．他的朋友都热情地鼓励他把他的想法公布与众，但他却小心谨慎。

His friends were ____ and encouraged him to publish his ideas, but he was _____.