__________ is the most difficult of all thelessons.— I agree. But it’s the most interesting.

How can I get well along withothers, father? —Try to smile to others, boy.That will make __________ much __________.

I ________ have used the computer without asking you first.[ ]

The reason for _______ he failed in the exam was that he was too careless.

The doctors arrived __________there at 9.00p.m..