Mark was a student at this university from 1999 to 2003, _______ he studied very hard and was made Chairman of the Students Union.
When you are reading,make a note of ________ you think is of great importance.
I’d like to work with ________ is honest and easy to get on with.
Water,which seems so simple and common,is ________ makes life possible.
I just wonder ________ that makes him so excited.
________ caused the accident is still a complete mystery.