You look tired.— Yes. I ___ non-stop until 8 o’clock.

What does the sign over there say?–No person ______ enter the area without official permission.[ ]

It seems that people are becoming more and more selfish.—How much happier life would be if we ________to the values of the past!

Care of the soul is a gradual process ______ even the small details of life should be considered.

The argument remains extremely heatedthere are necessary conditions of existence such as water on the Mars.