― Why ______ you stay in the countryside, where it is not convenient to go shopping?―But I’ve found it rather valuable for my health.

 Your teacher ________ very angry at that moment because you talked back to her like that.

It             be the vocabulary that caused you the problem in the exercise because you know a lot of words.

It’s really a great pity that all of you ____ leave so soon. It’s been pretty nice having you all at my birthday party.

This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.