must apologizeto Rebecca for being so rude, Sam—Why________ I say sorry It’s she ________ said insulting words first

______ do they get a present for their mother —Because it’s their mother’s birthday.

The man called his professor for help because hecouldn’t solve the problem by _________.

Today the weather was so cool _____ they had a great time there.

下列各句中划线字活用类型与其他三项不同的是（ ）