(2013·辽宁五校一模)The little child  ________ go out alone at night, so he ________   walk in the dark that night.

Though the “No smoking” signs have existed for long in public places, heavy smokers often ________ them and light up cigarettes.

Having walked in the desert for several days，we finally reached what was called oasis，________. 

. As a result of destroying the forests, _____ desert _____ covered the land.

A lot of children never fully ______ their mothers until it is too late.