[2013·安徽卷] From space, the earth looks blue. This is ________ about seventyone percent of its surface is covered by water.
| A．why | B．how |
| C．because | D．whether |
In order to make up for the lost time, they are working ______.
| A．like crazy | B．as crazy | C．like crazily | D．as crazily |
She used ______ on the right in China, so she was not used _______ on the left in England at first.
| A．to drive; to drive | B．to drive; driving |
| C．to driving; to driving | D．to drive; to driving |
____ finishing his homework, he went to play basketball.
| A．In | B．Upon | C．At | D．With |
He tried to invite some famous pop stars to sing in the concert ______, but failed.
| A．with free | B．for freely | C．with freedom | D．for free |
_____ we have finished the course, we shall start doing more revision work.
| A．For | B．Ever since | C．Now that | D．By now |