In the old days, people lived in caves and they had to make a fire _________themselves warm.
You will have no difficulty ____ the problem if you ______ it.
He devoted his lifetime ______ it possible for women _______ better education.
At weekends I prefer______ at home _____ a good rest.
-- Will you hold a party in the open air?-- I'm not sure, because it ___ the weather.
_______ the little girl was hit by a truck, nobody gave a hand to the girl ______ an old lady appeared. Why were they so cold-hearted?