—Is he coming? —I'm not sure.He may be late or,____, he may not come at all.
The post office is quite __________.
To understand the grammar of the sentence, you must break it __________ into parts.
I feel __________ necessary for her to learn foreign languages because the job she will do is __________ to foreign business.
They are good friends and share __________ with each other.
Do you remember there __________ a river here?