I had just about given myself up for lost _________ I was spotted by a ship.
Our bad living habits will destroy the earth.Only by changing________we live can we save the earth.
It was only when I reread his poems recently________I began to appreciate their beauty.
I got an email from my old friend last Sunday.Until then,we________in touch for nearly 3 years.
Many people believe that hunger is only a problem in the developing countries.________,it is a problem all over the world.
Born into a family with three brothers,David was________to value the sense of sharing.