—Where have you been? —I got caught in the traffic jam; ______ I’m here just on time.

My grandfather spends most of his time _______ because he loves nature. 

I have never fallen for this kind of trick. Even though you didn’t lie, it didn’t mean you were ______.

Kevin was not good at Chinese at first. After two months in China, _____, he made great progress.

Mr. Lin’s comments were very difficult to follow because they were ______related to the topic under discussion.