Nowadays, many people walk to work _________ the Copenhagen Conference calling for living a low-carbon lifestyle to cope with global warming.
You can't see anything clearly through a telescope unless it ________ correctly to your sight.
The special medicine for the disease was difficult to find though ________ everywhere.
So many problems ________, he is having a difficult time.
The book is so ________ that everyone who has read it will ________ it.
—Can you see the man ________? —Yes, I can.He is my neighbor Mr Smith, who is difficult to get along with beca use he always keeps everyone ________.