The lack of eco-friendly habits among the public is thought to be a major __________ of global climate change.
There are many things in different areas ________ we can do to reduce the possible dangers of AIDS.
Every time she was in trouble, she went to him for help, as he said he _____ do anything for her.
John plays basketball well, _____ his favorite sport is badminton.
After walking a whole day, I was almost________, not feeling bad, though.
During the reconstruction of the city , many modern tall building went up old shabby houses were torn down.