— Dad, would you please buy some strawberries for me? I love them. — I’d like to, but they are not _____ in winter.
is no doubt that the Great Wall is one of the wonders of the world.
— Whose Chinese vase is it? — I have no idea, but I’m pretty sure it _______ the old lady.
Mike ________ his car, for he came to work by bus this morning
______ is known to all,the Amber Room belongs to the Russians.
_____ these experiments were successfully completed would we think of going into humans.