I always go to Mochou Lake Park at weekends and enjoy ___________ there.
Is that your best friend Kitty?— No, it _________ be her. She flew to Singapore yesterday.
---Excuse me, Sir .But smoking is not allowed here.-----Sorry,I didn’t see the sign.I’ll __________ my cigarette at once.
—Would you mind my sitting here, Sir?—_________. It’s for my wife.
I_______ my homework when the door bell__________.
What are you busy doing, Sandy?—— I’m making some flash cards _________ me remember English words.