Mary felt sad over the loss of photos she had shot inAustralia, ______ that was a memory she especially treasured.

Life is the most important in the world so we should never compromise _____ safety standards

More and more problems appeared ________the increasing use of short messages sent by cell phones

________ do you go to work every day——Take a bus.

Last night, I was ______ tired ______ I didn’t finish my homework.