She had to ______ their young children by herself after her husband died.
Paper _____ the fibres of plants for many years.
The books, _____ the dictionaries, must be put back where they _____.
What a strange man! He loves his wife, but _____ he often beats her.
The problem was that it is ___ valuable ___everyday use.
But later people developed a way of printing, _____rocks.