______ on ten years of observation and study, the theory shows that every one dreams every night, whether they realized it or not.
| A．Basing | B．Based | C．Being based | D．Having based |
—I didn’t expect that John would be absent from my last Sunday’s birthday party.
—As far as I know, he ______ to see his parents in the countryside on Sundays.
| A．goes | B．went | C．has gone | D．had gone |
_____ to improving services, we will provide customers with all the information they need.
| A．Being committed | B．Having committed |
| C．Committed | D．Committing |
“I’d like to give my thanks to those _____ help my son was able to survive this terrible disease,” said the woman on TV.
| A．who | B．whose | C．with whose | D．with whom |
After the earthquake, many people had to be _____ in the tents because most of their houses were badly damaged.
| A．put away | B．put out | C．put up | D．put off |
I admire my English teacher. I can remember very few occasions ________ she stopped working because of ill health.
| A．that | B．when | C．where | D．which |