making copies at work, and someone came into theroom while talking on his cell phone. Should I have left _____ him privacy

With so many noises from the busy traffic in the street, I couldn’t______ and do my research work.

Last month 3 people got injured in a gas explosion, has not been discovered yet.

We should find a _____place for a picnic. I mean, it is not far away from here and it is very quiet.

A fish needs water and without water it will die ______.