_____ is a fact that English is being accepted as an international language.[ ]

With the help of high technology, more and more new substances ___in the past few years

The riseof oil prices made scientists search for new energy resources ______ oil．

Such signs _____ we use in the experiment ______ Greek letters. [ ]

The film of “ Great Earthquakes” directed by Chinese director Feng Xiaogang, _______ is reported, won the most medals in Harbin Film Festival on January15th, 2011