With two sons ______ in Afghanistan, John and Susie Mayes are working extra hard this year to make sure their grandchildren have a great Christmas.

With efforts _______ conservation, we may believe that people enjoy a healthy life without the environment around them ________. 

There      a lack of money, we had to put off building this special school. 

Nothing could be done at the meeting, the chairman_____ absent.

________，John returned to school from his hometown.