Half of the class _____ done most of the work ．The left _____ rather difficult．

’s search engine Baidu has announced the top topics discussed by netizens in 2013, research from its linked website Hao123.com.

Energy ______ under the earth must give off in one form or another, for example, an earthquake.[ ]

_______ is expected, according to the online survey, is _______ the price of housing will not go up any more

It’s in the city you are going to pay a visit to _____ this kind of beer is produced.