There is a limit __________ people's life, but no limit __________ the knowledge.
| A．on; to learn |
| B．to; to learn |
| C．on; learning |
| D．to; to learning |
34．Although he Was in poor health，Robert succeeded——other more famous engineers failed．
| A．which | B．that | C．what | D．where |
33. I've promised to keep it secret so I Can’t really tell you anything——what you know already．
| A．for | B．about | C．of | D．beyond |
32．1 want to buy that kind of cloth because I have been told the cloth———well．
| A．wash | B．Washes | C．washed | D．is washed |
31．A study shows that students living in non—smoking dorms are less likely to——the habit of smoking．
| A．make up | B．pick up | C．draw up | D．turn up |
30．——is a good chance that he is willing to allow U8 to join in the ball game．
| A．There | B．It | C．That | D．This |