He _____ his parents that he has failed in the exam.
| A．dares not tell | B．dares not telling | C．dare not tell | D．dares not to tell |
My mind wasn't on what he was saying，so I'm afraid I ________ half of it.
| A．was missing | B．had missed |
| C．will miss | D．missed |
All the preparations for the task ________，and we're ready to start.
| A．completed | B．complete |
| C．had been completed | D．have been completed |
Selecting a mobile phone for personal use is not an easy task because technology ________ so rapidly.
| A．is changing | B．has changed |
| C．will have changed | D．will change |
Visitors ________ not to touch the exhibits.
| A．will request | B．are requested |
| C．are requesting | D．request |
—Sorry，sir，your car isn't ready yet.
It ________ by our workers.
—Oh，my God，when can I come to fetch it?
| A．is repaired | B．has been repaired |
| C．is being repaired | D．will be repaired |