David, you _____play with the valuable bottle; you_______ break it.

A giant of a man was standing in the doorway. His face was almost completely hidden by a long and untidy hair and a wild beard, but you ______ make out his eyes, shining like black beetles under all the hair.

I was really anxious about you. You____ home without a word.

—May I smoke here?    —If you _____, choose a seat in the smoking section.

The doctors are doing all that they _____, but the old man is still not breathing properly.

---Fifty dollars for such a T-shirt！You_____ be joking！
--- I’m serious. It’s made of silk.

--- Isn’t that Ann’s husband over there ?
--- No, it _______ be him--- I’m sure he doesn’t wear glasses.

When I went to their house, there was no light on. They _____ at home.

I was really busy these days, otherwise I _______ to your birthday party last night.

The company is quite honest and guarantees the new product ______ be under warranty for three years.