(2009·湖北) 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.
At long last the child was found on top of ______ we call the museum of science and technology.
Personally, the job as a teacher _____ be challenging, for I sometimes _____ deal with some smarter but less diligent students.
Nowadays, _______ cars are more and more popular.
I don’t know why he ________ in the middle of a sentence.
College graduates are offered lots of available jobs, ______, I believe, they can fully demonstrate their knowledge and competence.