From space, the earth looks blue.This is ________about seventy-one percent of its surface is covered by water.
Few houses in the village were left ______after the earthquake.
It was so dark in the cinema that I could hardly ______ my friends.
Those who are ______ their present situation will surely make no more advance in life.
All her energies are ______upon children and she seems to have little time for anything else.
At times the balance in nature is ______,resulting in a number of possibly unforeseen effects.