nt years, _____ problem of global warming has been very serious—That’s right People are facing ____ number of natural disasters now

_______ which whis sister from time to time.

If you for your favorite TV programs, you will feel sleepy.

You must notice ____ the emergency exit is when youenter the building．

________ is no doubt _______ Mo Yan, this year’s Nobel Prize winner in Literature, ever did so much on his way to success