---Could you do me a favour?----It depends on it is.
The doctor came out and said the operation was well finished. The parents smiled ________ and the nervousness disappeared from their faces.
Rainforests _______ and burned at such a speed that they will disappear from the earth in the near future.
Smile is recognized as a/an _________ language, which can be understood by people all over the world.
The conference has been held to discuss the effects of tourism _______ the wildlife in the area.
Effective measures should be taken to ______ the rare species _______ being over-killed by human beings.