You ________ pay too much attention to your reading skill, as it is so important.
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.