Human beings are different from animals _______ 
they can use language as a tool to communicate.
| A．in that | B．for that | C．in which | D．for which |
Scientists across the world agree that this is an invention of ____ great significance, ____ invention that will greatly change human life.
| A．a; the | B．a; an | C．/ ; the | D．/ ; an |
---Excuse me, Dad, but I am going to the club to meet my friends in the football team.
---OK.
| A．Good luck | B．Have fun | C．With pleasure | D．Congratulations |
It is well known to us all that a lot of rivers _______by factories.
| A．are polluting | B．have been polluting |
| C．are being polluting | D．are being polluted |
I feel ____to have been invited to give a speech here.
| A．honour | B．great honour | C．honoured | D．honouring |
It was along the Mississippi Rever ____Mark Twain spent much of his childhood.
| A．how | B．which | C．that | D．where |