Even though the pure water is ____ gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.

They find themselves surrounded by colorful rocks, fishes, seashells and plants, all ____ slowly in the blue water.

They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.

But at other moments you will find him gentle and weak, _____ he cries about the lost lives of people drowned in ships that have sunk.

He cut off the electricity immediately he found the dangerous situation, thus ____ a fire accident.

My bicycle is nowhere to be found. Who ___ have been using it?

It is hoped that these new discoveries will throw ____ light upon such ____ mysterious natural phenomena.

---- What about the two MP3s? 

---- Sorry, but I don’t like _____ of them. Would you please show me a third one?

The Turners consider ____ a computer, which is commonly considered ____ a great help in our work and study.

A recent report found that women graduates are more likely than non-graduates ____ childless throughout their lives.