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We can never expect _______bluer sky unless we create ______ less polluted world.

The famous director Li’an failed many times but he eventually _____ to achieve success.

Rather than sticking to the principles stubbornly, China is now adopting a new concept in economic policies in a/an _______way that shows its own characteristics.

Death toll from Typhoon Haiyan in the Philippines _______ 3,637, after the strongest storm this year destroyed the central part of the country on Nov. 8, 2013.

Corruption is _______ problem in countries across the world, with developing countries often believed to be more serious, although there is no evidence to suggest this is _______case.

— How much influence will your time in high school have on the rest of your life?
— It ______ be quite a lot, or perhaps only a little.

Up to now, no one has come up with a（n）       explanation of why dinosaurs died out, and it remains a mystery．

As a photographer, I’m used to keeping the camera easily      on an outing.

When Ben’s house was on fire last night, several neighbors rushed to his    and put out the fire.

When I graduate from this famous university, I’ll _______  what I have learned to everyday life.