He is such a strong-willed person that there is nothing in the world that can _____ him.
Which of the following is wrong? This book is easy enough for ______.
Fifty-six ______ twenty-seven makes eighty-three.
Every means ______ tried, yet no result ______encouraging up to now.
Peter was ______ to come to school this morning.
Tom with his friends ______ volleyball since three o'clock.