When _______ homework , you should be careful .
In salad bars the waiter does not bring you salad. You have to____ yourself, usually to as much as you want.
---How do you like the film? ---There was nothing special--- it was only ____.
--- What are you going to do next? --- To write a science story about outer space ___ by Science and Technology Press.
I'll be home late, but please don't stay ____ for me.
---Mary has a very low opinion of George. ---It can' t be any worse than ____ of her.