—Will you go to Mary’s wedding party tonight?—I’m afraid not. I _______ my brother’s.
We all consider ______ important that we should put theory into practice.
Just like fingerprints, each person’s DNA is ________unless he has a twin.
The boy felt quite happy because he was closer now to ______ an answer of his own.
Taking charge of the big company, I’m afraid, is _____ his ability.
When the fire________,the people in the building lost their head and ran in all directions.