Fill in the blanks with when, although, unless, or because.

 The girls are happy they have won a prize.

My principal was angry with those students they destroyed school property.

The boy failed he had studied hard.

Rajis came late she missed the bus.

 he is tired, he works the whole day.

  my father came back, we were already in bed.

 Peter did not greet me he saw me.

I was driving, I saw the accident.

you stop smoking, your health cannot improve.

 I dislike him, I help him.