—Well, I do think the iPod is a smart, convenient and intelligent. —________.

There were some chairs left over _____ everyone had sat down.

 Without facts , a person can’t form a correct opinion , for he needs to have actual knowledge _____ his thinking .

With his work completed, the businessman stepped back to his seat, feeling pleased_____ he was a man of action. 

There are some warnings in some countries ______ over exploitation of underground water has caused the decline of wetland and increase of desertification.