—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may |
| C．must; can | D．may; must |
About 270 million people in rural areas in China have no to safe drinking water.
| A．entrance | B．access | C．solutions | D．sources |
I sooner but I didn’t know that they were waiting for me.
| A．had come | B．was coming | C．would come | D．would have come |
is known to us all is that the 2012 Olympic Games will take place in London.
| A．As | B．What | C．That | D．It |
Was it because of the heavy snowstorm in Europe the flight had to be put off?
| A．which | B．so | C．why | D．that |
In no place of China little about the economic development nowadays.
| A．the local government cares | B．does the local government care |
| C．doesn’t the local government care | D．cares the local government |