Only when _______ hard _______ make your dream come true.
| A．do you work; you can | B．you work; you can |
| C．you work; can you | D．do you work; can you |
—I drove to Zhuhai for the air show last week..
—Is that ________ you had a few days off ?
| A．where | B．when | C．what | D．why |
What is even more important is______ the earth cooled down, water began to appear on its surface.
| A．that | B．that as | C．which | D．which as |
His idea was such a good one ______ we all agreed to use it.
| A．as | B．that | C．so | D．but |
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
With just four years _______, the Brazil Olympic organizers have promised to deliver an equally inspirational ceremony.
| A．gone | B．to go | C．going | D．go |