--What kind of job have you ever done before?
--Oh, I _________ for an engineering company for three years,
| A．work | B．have worked | C．worked | D．had worked |
__________ your attention focused on practicing, and you can reach your goal of becoming an excellent pianist.
| A．Keep |
| B．Keeping |
| C．To keep |
| D．If you keep |
Anyone who wants to go raf-ting this weekend, raise your hands please，__________？
| A．doesn't he |
| B．don't they |
| C．do you |
| D．will you |
Bring the flowers into a warm room __________ they'll soon open.
| A．or |
| B．and |
| C．but |
| D．for |
Please do me a favor-__________ my friend Mr. Smith to Youth Theater at 7 ： 30 tonight.
| A．to invite |
| B．inviting |
| C．invite |
| D．invited |
If you have a job，__________ yourself to it and finally you'll succeed.
| A．do devote |
| B．don't devote |
| C．devoting |
| D．not devoting |