The days we look forward to ____at last.
We share the resources of the world, ______ any action of waste can affect other people.
Mary wrote a letter to her parents, ______ she missed them and was studying hard.
When you come across difficulties, it is ______ of you to expect the worst.
She looked in the direction of the window, but there was nothing in front ______ the deep darkness.
I suddenly realized that I was kept so busy that I ______ little time with my family before.