_____ you make a promise, you should keep it. 

I like to listen to music ______ I’m having a walk in the evening.

 None of the underwater workers has been harmed by the great fish. ________, most fish were so friendly that they played with the instruments.

The reason _______ he gave for being late was ________ he overslept this morning．

Seeing the policeman, the thief was behaving __________ nothing had happened.