It is only when an NBA player has aged and been through many battles _____he learns an important lesson;there is no "I" in "team".
____ we are alone, we can speak freely.
The chairman thought ____ necessary to invite Professor Smith to speak at the meeting.
It is not expected ____ he said caused so much discussion at the meeting.
He is always ready to help others. That’s one of his _____.
Please remind me in case I ______ forget.