–I am leaving for Madrid tomorrow,Caroline.--- _______
If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it.
By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course.
_______ more to be pitied than blamed.
Earth is believed ______ by an object the size of Mars at some point in the distant past before its surface cooled.
With temperature ______ so rapidly, we could not go with the experiment.