About 85%of the Australian population of 20million______in the six major cities around the coast nowadays
—Why are you excited today? —We have been told ______ a picnic this weekend.
_______ great picture! Who painted it?
When you ______ at a restaurant, please order just enough food.
Mr Lin, a famous writer, _______ our school last week.
Smile to the world, ______ the world will smile back to you.