--How old can you guess your new English teacher is?--It’s hard to say. But I guess him to be _________ between 35 and 40.
____ 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.