His essay, ____many times,was brief and to the point,and therefore won the first prize in the writing competition.
It’s good that we _____ to the park because it’s started to rain.
Look at that little boy wandering about — perhaps he _____ his mother.
“Did Jim come?” “I don’t know. He _______ while I was out.”
“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”