------ Bob failed in the exam again . ------ He _____ it ; he never worked hard .
If you really want yourself to be in good health, you must ___ always ___ so much.
One ought _____ for what one hasn’t done.
I didn’t see her in the meeting room this morning. She _____ at the meeting.
----Did you happen to see ____ black and ____ white cat? ----Is she missing? I told you to take care of her.
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.