8. He was so deep in thought, thinking of the problem ______ he knocked into the tree without noticing it.
| A．when | B．while | C．because | D．That |
My friends urged that I ________ the well-paid jobs.
| A．applied for | B．applied to | C．apply for | D．apply to |
On weekends the Smiths usually drive to the countryside and ________ the fresh air there.
| A．take off | B．take up | C．take out | D．take in |
In face of the challenge for the moment, it’s most important to ______ a good state of health.
| A．keep up | B．keep away | C．keep off | D．keep out |
Fully ________ in my office work, I have little time for housework.
| A．occupy | B．occupied | C．occupying | D．to occupy |
Nancy reminded me of what I should ________ have forgotten.
| A．therefore | B．instead | C．otherwise | D．besides |