If I ____ you, I would join the army.

--Can I have something to eat, Mum? I feel hungry.   -- You ____ be hungry. You’ve just had some bread and ham. 

He ______ the key, so we ______ into the office.

Let’s clean the classroom, ________?

 I really don't know how to thank you, but for your help, I ________ my lost necklace.