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 |
I really don’t know _________ I had my money stolen.
| A．when was it that | B．that it was when | C．where it was that | D．it was where that |
The teacher asked Jim _______________.
| A．why was he late for school | B．why he was late for school |
| C．how he was late for school | D．how was he late for school |
The writer is very popular with young people ____ he has been dead for many years.
| A．ever since | B．even if | C．as if | D．so that |
My manager told me ____ the same mistake again or I would be fired.
| A．don’t make | B．not make | C．not to make | D．to not make |
Tom ____ skating, so he spends all his spare time on it.
| A．is popular with | B．is concerned about |
| C．is proud of | D．is crazy about |