Had he not let me know, I__(not collect) him at the airport tomorrow morning.

1). by hook or by crook.

  try to use any effort  to achieve the goal. try not to shun anything in the quest to get what you want.

2).   a fool and his money are soon parted.

a fool does not know the value of money. stupid man quickly loses or wastes it, if it suddenly appears.

3). the proof of the pudding is in the eating.

the pudding should be eaten, to understand and appreciate its taste

4). a good wife makes a good husband.  

a good wife does not speak badly about her husband. a smart woman does everything for the manifestation of the best qualities of her husband.

5). a good name is sooner lost than won.

great efforts are necessary  to create a reputation, but you can lose it very quickly in a risky enterprise.

6). the exception proves the rule .

exceptions denote that there is a general rule that they will not obey, but which may explain their presence.

7). soon learnt soon forgotten.

if you learn something without having to work, it will soon be forgotten.

8). the boot is on the wrong foot..

awkward thing or person. some features of a person  prevent him(her) from joining any common enterprise or any  company.

9) too good to be true.

this combination of good qualities favorable circumstances is unrealistic and suspicious. most likely, it is either deception or delusion.