A．Paul didn’t want to come to the get-together.
B．Paul didn’t take part in the get-together because his train was late.
C．Paul didn’t take part in the get-together because it was not interesting.
D．Paul took part in the get-together and found it was fun.

A．Because the Earth is heavily polluted.
B．Because nature cannot recycle its resources.
C．Because there are more and more people living on the Earth.
D．Because no more new resources can be added.