— I rang you at about nine, but there was no reply.— Oh, that was probably _____I was seeing the doctor.

.We were just about ready to leave _____ it started to rain. 

_____ is known to us all is that to work hard to achieve a goal is more important than only to have a goal.

Anger is good for you, ____ you control it properly, according to new psychology research.

Someone called me up in the middle of the night, but he hung up ______ I could answer the phone.