Hi vil,
1.1. Will it be
convenient if I come at six?
1.2. Will it do if I come at six?
2.1. I’m
sick and tired after that fuss.
2.2. I’m quite
done up after that fuss. "Done in" would be better here.
3.1. He
must give up smoking if he wants to find favour in her eyes.
3.2. He
must do away with smoking if he wants to find favour in her eyes.

3.3.
Smoking must be done away with if he wants to find favour in her eyes.
4.1. I advise you not to have
anything in common with that mean person.
4.2. I advise you not to have
anything to do with that mean person.
5.1. Can you
manage without a smoke for an hour or two?
5.2. Can you
do without a smoke for an hour or two?
6.1. I must confess they
treated me generously.
6.2. I must confess they
have done me many a good turn.
