They also agree that it is the burning of more and more fossil fuels that has resulted ____ this increase in carbon dioxide.
Mary ought to attend school this autumn, but she ______ up early in the morning.
----Will you go shopping now? ---- Not until I _______ my experiment.
------I’m worrying about my coming examination. ------Well, you will succeed in the end _______ you work with a strong will.
The magazine I like best _________ once a month.
With the old man ______ the way, we had no trouble in finding the village.