We like elephants , because they are interesting . And we like dogs , ______.

She said she would return the dictionary to me ________.

You look tired these days. I think  you need a  ________sleep. 

 --Are you satisfied with the air today? --Not at all, it’s so foggy that I often get a cough. I think we all need much ________air to breathe.

The car accident happened ______ a cold winter morning.