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

With so much homework ________, I have to stay at home, giving up the idea of playing computer games with Peter.   

With everything important _______, my father is now lying on the beach, enjoying the bright sunshine and fresh air.

He refused to sell the old house, for it had too many pleasant ________with his childhood. 

With many problems ________, the newly selected president will have a hard time.