Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.
She made the demand that she ________ at once.
To my joy, I have _____my parents to allow me to travel abroad alone in the coming summer holidays.
--I think _____possible that he has got the ticket for tonight’s concert . --So do I. He seemed very happy for the whole afternoon.
Mr. Li’ s house is so big, about _____ours.
Up to now, Marin _____in the library for about two hours.