– Excuse me, sir. But nobody _____ smoke here in the lift!
-- Sorry! I didn’t see the sign.

When we were in the college, we       stay in the library, devoting ourselves to books.

---- It’s the office! So you _____ know eating is not allowed here.
---- Oh, sorry.

Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.

---You needn’t take an umbrella. It isn’t going to rain.
---Well, I don’t know. It __________ do.

I ______have come here in time, but I met an old friend of mine. I stopped and talked with him for some time.

--- We want someone to design the new art museum for us.
--- ____ the young fellow outside have a try?

—May I watch TV for another 15 minutes, Mum?
—Oh, dear, if you _____.

You      remind him to keep things neat and tidy, because he is well organized.

Mike ______have stolen the money from the bank,______he appeared to be rich overnight.