Nobody witnessed the accident, so people reached a conclusion about the possible cause of the accident.
| A．alternative | B．brilliant | C．competent | D．tentative |
Most of his mistakes _______ out of his nervousness, I am sure.
| A．arose | B．raised |
| C．rose | D．lifted |
Mary took _____ advantage of the opportunity and tried to make _______ good impression on her new boss.
| A．an; a | B．不填；a |
| C．an；不填 | D．不填; 不填 |
--If we don’t do our best to reduce pollution, man’s history won’t last long.
--_________.
| A．It’s OK | B．You are absolutely right |
| C．That’s all right | D．Mind your own business |
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 |