The village has developed a lot ________ we learned farming two years ago.

In most cases, customers can’t help ______ to buy things they actually do not need.

_______ good use of learning resources such as the website and library, and you will make great progress.

This is _______ empty bottle. But it is _______useful one.

Heavy smog (雾霾 )in eastern and central China seems to get more and more serious.—I agree. Something to deal with it.