71.
That is something of which I'd rather not talk about.

72.
Kailash insisted him to do this work.

74.
All work and no play make Jack a dull boy.

76.
He has frightened many a people by his gun.

77.
The farewell took place last Sunday.

79.
Scarcely had he left when his friend came.

80.
I told him what to do and how he does it.