You ought to have given them some advice.–________, but who cared what I said?

He found ______ very helpful to memorize the words of some popular English songs.

Look! The light is still on. Is Mr Wu working in his office？—No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.

I know the man ______ the green bike.[ ]

My watch is broken. I want to know how to make it ______.