I’m sorry I made a mistake! -______. Nobody is perfect.

finished off two pizzas!—Yes But the second is ___________little bit small, so may I have __________ third one

It was reported that the North Korea’s decision to send a satellite into space ___ an international argument. [ ]

What do you think of math—- I think it’s useful, so it’s ______ for us to learn it well.

I think _______ is really difficult for us to work out this kind of math problem.