______ by a greater demand of vegetables, farmers have built more green houses.
When a pencil is partly in a glass of water, it looks as if it ________’
._____from heart trouble for many years, his father has to take some medicine with him wherever he goes.
To be _____debt is to be ____danger.
—Coffee________tea? —Coffee________no sugar, thank you.
.Can you still remember the days_________we spent together in Chongqing last summer?