83．We make use of e ____ to run machines.　　　　　　　　 83．____

82．Maths, physics, chemistry and biology are n ____ science.　　 82．____

81．The radio doesn't work. It needs r____.　　　　　　　　　 81．____

80．____

80．It has a h ____ of 5 cm, a length of 10 cm and a width of 4 cm.

79．Wait here and stop the tall man as he p ____ by.　　　　　　 79．____

78．The girl joined the Young P ____ at the age of eight.　　　　　 78．____

77．I'm hungry. Let's look for a r ____ to have lunch.　　　　　 77．____

76．____

根据下列句子及所给单词的首字母，在句子右边的横线上，写出空缺处各单词的完整形式。(每空只写一词)

76．A d ____ is a book in which one can find out the meaning of words.