_____I think of the happy old days, I can’t help smiling.
The old man used _____ in front of his house and he has got used to _______ like that.
Mr. Brown, ______ chairman of the trade union, will visit our factory in _____ month of May.
He has called several times this morning, ____ there is something very urgent.
You have to wear special clothing, a helmet and a life jacket ____ your raft gets turned upside down or sinks.
I wonder if ____ to come over to my family after work.