We are going to talk about the problem _____ at the last meeting.
| A．discussed |
| B．discussing |
| C．to discuss |
| D．being discussed |
The book was written ______ careful observations and detailed studies.
| A．on behalf of | B．regardless of |
| C．on the basis of | D．in relation of |
A short man appeared suddenly in the doorway, and Dave had to pull up __________ so as to avoid bumping into him．
| A．merely | B．sharply | C．shortly | D．desperately |
There is nothing worse than putting in the effort to plan and prepare for a trip only to arrive at a ____ hotel with disgusting service．
| A．ridiculous | B．shabby |
| C．comfortable | D．convenient |
I am ______ about the new model, and I firmly believe that there will be a good market for it.
| A．concerned | B．doubtful | C．confident | D．particular |
You had better ______some time every day for sports so that you can keep yourself energetic.
| A．set aside | B．take up |
| C．put away | D．give out |