My goodness! I failed again in the computer test. —________. The world is not at an end. [ ]

years of effort, Leonardo DiCaprio finally won his first Oscar.— It proves that hard work success.

While Helen ________ the piano，her mother came in．

You can’t imagine that a well-behaved gentleman ______ be so rude to a lady.[ ]

China understands the situation and needs of underdeveloped countries on the issue of climate change and urges developed countries to support them ______ technology and finance.