We can never expect bluer sky unless we create less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
He likes sports, ________ I’d rather play games on computers.
| A．as | B．while |
| C．however | D．even if |
________ he is the last man I wanted to see, I did my best to help him.
| A．As | B．Now that |
| C．Although | D．However |
He tried his best to solve the problem, ________ difficult it was．
| A．however | B．no matter |
| C．whatever | D．although |
Mo Yan was awarded the Nobel Prize for Literature in 2012, ________ made one of the Chinese people’s long-held dreams come true.
| A．it | B．that |
| C．what | D．which |
The fires burned for three days, ________ a total of 25,000 buildings.
| A．destroyed | B．to destroy |
| C．having destroyed | D．destroying |