Many awful facts have shown that it is totally wrong to environmental protection when we develop economy.

Scientists think that the continents ____ always where they ___today

__ the thick trees, the bitter windwould have blown the house t pieces

Now that their parents are dead, the poor boy doesn’t know ________ the money they left.[ ]

I ______ my university professor in thesupermarket near my house, which was out of my expectation.