在下列各句的空格内填上一个适当的完整的单词，该词的首字母已给出。
Newton was sitting under an apple tree when an apple f　        onto his head.
In my hometown, the weather of this summer is much h　        than that of last summer.
Tom and Jerry r　       their bikes to Uncle Ma’s Farm twice a month.
The mother cat was killed, and the baby cat had to live by i　       .
Pass me that pair of glasses, please. I can’t see the words c　       .