_____ the Internet brings much profit in, it can cause o lot of social problem.
—_____I stay with you?— Well, I would rather you_____me alone for a while.
Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.
China is a peace-loving country and _____no circumstances _____ first use nuclear weapons.
In the past decades, sea ice _____in the Arctic as a result of global warming.
In our country the cold weather in the north_____ sharply _____the hot weather in the south.