You have to wear special clothing, a helmet and a life jacket ____ your raft gets turned upside down or sinks.
Can you lend me the novel ______ the other day?
I have seen trees, _____ open at sunrise and close at sunset.
___ is known to all, China is a developing country, belonging to the third world.
She showed her new watch to my wife, ___ was kept in a box.
The reason ______he didn't come was ______he was ill.