It never occurred to me ___________ you could succeed in persuading him to change his mind.
| A．which |
| B．what |
| C．that |
| D．if |
______ the sound on the step, the boy rushed out to see if his mother had come back.
| A．To hear | B．Hearing | C．Heard | D．Hear |
His answer was _______, so no one could make out what he meant.
| A．ambiguous | B．unconscious | C．transparent | D．explicit |
_______ you don’t stay out too late, you may go to the party. But remember to be back here no later than 11:30 pm.
| A．Now that | B．Until | C．Provided that | D．Although |
Unfortunately, when I dropped in, Dr. Green ______, so we only had time for a few words.
| A．just left | B．has just left | C．had just left | D．was just leaving |
The animal makes a strange sound, slightly ______ the bark of a dog.
| A．resembling | B．requesting | C．resisting | D．reflecting |