________ is bad for your eyes ________ TV too much.
---Did you write an e-mail ____ your online friend yesterday?---Yes. But I didn’t hear ____ him.
Could I have a look at your ipad? ---___________. I am playing a game now.
---__________ is the most difficult of all the lessons.--- I agree. But it’s the most interesting.
---Can __________ work out the problem?---__________, I think. It is too hard.
---Can you see __________ bright light in the sky?--Yes, I think it’s __________ UFO.