She went home only to see that the house...... upside down by her children.

If I had known you were going to be here, I wouldn’t ………..

I picked up a coffee while I ...................... to school.

The issue we need to concentrate ........... here is very serious.

Do answer the door,................. you?

A: Is it John's turn to start the game? B: No, it isn't. It's ----------- --.