如图所示是光纤传输的原理图，光纤是由非常细的玻璃纤维构成，激光器发出的光线基本是笔直地进入一端，它主要是利用光线的______特性，把信号从一端传递到另一端的．

在下列各句的空白处填入一个适当的词，使句子意思完整、语法正确。（5分）

Please t_______ these sentences into Chinese.

He c________ reading his novel after he finished his homework.

Nick never tells lies. He is an h_________ boy.

The population of the world is i_________ very fast.

My clothes are s________ to Sally’s because we have the same taste.