Those who have ______ floods and sandstorms know the importance of environmental protection.

The books are so nice，which one can I take —Oh，you can take ________ of them．I’ll keep none．

Are you pleased _____ the food here— Yes, I have got used _____ the life here.

Could you be so kind as to close the door?—______.

The parents were shocked by______news that their sonneeded______operation on his knee.