At the sight of her mother,the surprise in her face was ____ by joy.
We students should hunger_____ knowledge and_____ ourselves with knowledge for the competition nowadays is very fierce.
.It is no use ______ after you know your failure.
. He was in hospital for six months. He felt as if he was ___from the outside world.
His suggestion is worth_____.
It is re ported that the United States uses ___ energy as the whole of Europe.