Having proper motivation is not _______ —it is another key to success.
| A．artistic | B．enterprising |
| C．investigate | D．optional |
Every worker should follow the rules of the company,myself_________．
| A．including |
| B．included |
| C．to include |
| D．having included |
Rock climbing can be_________,so I suggest you go to bed early tonight.
| A．tire |
| B．tired |
| C．tiring |
| D．to tired |
---I have got a headache.
---No wonder. You_________in front of the computer too long.
| A．work |
| B．are working |
| C．have been working |
| D．worked |
You_________m；e to deal with everything for five years. I can't thank you more.
| A．have been helping |
| B．had helped |
| C．helped |
| D．help |
The injured mountain climber gathered all his_________to climb up the high rock, where he might be seen by someone passing by.
| A．strength |
| B．power |
| C．energy |
| D．force |