Thousands of years ago, people killed the wild horse that lived around _____ food. _____ time, people began to catch and raise animals .
Deeply _____, I thanked him again and again.
_____ if he had any difficulties, he made no answer.
_____ hard, you will succeed.
We walked as fast as we could, _____ to catch the 9:30 train.
It is no longer a question nowman can land on the moon. A.that B.if C whether D what