You won't pass your exams________ you work harder.
Shanghai World Expo was the most important _____ in China in 2010.
—I hear that Tom’s father has gone to Africa. —Really? ____
Mrs. Wang found his little son ______ with his toys alone when she arrived home.
Our physics teacher told us that light _______ faster than sound.
She will have a holiday as soon as she _____the work next week.