73．The exercises are designed to ________ (增强) your stomach muscle.

72．Her moods are as ________ (易变) as weather.

71．Christmas is celebrated in ________ (十二月).

70．The naughty boy was ________ (缺席) from school again.

69．All the staff in the company were asked to ________ (捐赠) two days’ pay to charity.

68．The train was so crowded that he found no room to place his ________ (行李).

67．Mr. Wang is always very ________ (严格) with his students.

根据所给汉语提示用适当的单词完成句子。(每空只写一个单词)

66．A great many ________ (志愿者) went to the disaster-stricken areas to help the victims.