Mr. Green didn’t post the letter _________. He asked his son to do it for him.

─ I don’t think cycling is as exciting as climbing. ─ That’s because you can’t ride well. , both of them are interesting.

Could you please help me to take these books there —_____.

l never forget the days Ispent in Beijing University, hasa great effect on my life.

Recently I received a letter from him, and _____ was a big surprise for me.[ ]