They will pay a visit to Europe in a couple of years _____ they have enough money

Look! Some boys are playing baseball, ________ arechasing, they all have fun.

_______ the rain falling so hard, it becomes more and more difficult to carry on the rescue work.

One evening when it was so warm, I stayed awake _________ until half past eleven in order to have a good look at the moon by myself.

He decided that he would drive all the way home instead of ________ at a hotel for the night.[ ]