______almost one hundred jin, the stone was moved by him alone. 

The scientist spent years alone in the forest，____ by eating wild fruit and small animals．

If the babysitter cannot come tomorrow，do you mind________alone at home，doing his homework?

When ________ questions in class, one should answer them as clearly as possible.

_________ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.