As there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.

Managing money has long been a headache for students mostly supported by their family, who find it ________ to deal with their finances.

John once worked in a remote mountain village school, which is ______ only on foot.

-How are you getting on with your English study? --________. I tried my best, though.

Your novel is perfect; I’ve never read _______ before.