If you are not familiar ____ the topic, you may write something that is familiar ____ you.
She _______ to the waiter whose language isn’t ______ hers to bring some more coffee.
As to the subject, we have consulted the most _______ professor who gave us _______ explanation.
“ Do you mind if I keep pets in this building?” “________________”
The headmaster could not go to the meeting; therefore, Mr. Smith _______ him.
The policemen regretted _______ as soon as possible at the alarm.