The storm left，________ a lot of damage to this area .
| A．caused | B．to have caused |
| C．to cause | D．having caused |
John was dismissed last week because of his ______ attitude towards his job.
| A．informal | B．casual | C．determined | D．earnest |
My morning ______ includes jogging in the park and reading newspapers over breakfast.
| A．drill | B．action | C．regulation | D．routine |
Since Tom ______ downloaded a virus into his computer, he can not open the file now.
| A．readily | B．horribly | C．accidentally | D．irregularly |
At minus 130℃, a living cell can be ______ for a thousand years.
| A．spared | B．protected | C．preserved | D．developed |
The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |