I am sorry I did not keep in touch with my old school friends.
REGRET
I .................... touch with my old school friends.
'Why did you not tell me the truth, David?' Emma asked.
KNOW
Emma .................... David had not told her the truth.
My best friend is the only person I can rely on completely.
APART
There is .................... best friend I can rely on completely.
It is possible that she did not receive the invitation.
MIGHT
She .................... the invitation.
My friend convinced me to apply for the job.
INTO
My friend .................... for the job.
George has not played chess since he left university.
TIME
The .................... chess was when he was at university.