The doctor fixed some of the old woman’s _______.A. tooth B. tooths C. teeth
_____ prepare for the coming exam, Dave stays up late every night.
We can’t put off _____ a plan. We should do it right now.
--- The twin boys look sad. Let’s _____ .--- OK!
I saw a dog _____ on the side of the road when I passed by.
To _____ surprise, no one volunteered for the position of monitor.