Many countries are increasing their use of natural gas, wind and other forms of ______.
There are other matters which I don’t propose to ______ at the moment.
One evening, I was with my friend Auguste Dupin at his house in Paris when he had a visit _____ Georges Godinot, head of the Paris Police.
. When he ______ the door, he found his keys were nowhere.
—Putting on a happy face not only helps us make friends but also makes us feel better. —______.
___ Mary is sleepy, she insists on finishing her homework rather than ___ to sleep.