We ______ last night, but we went to the concert instead.
| A．must have studied | B．might study |
| C．should have studied | D．would study |
The teacher said that ____________________.
| A．light travel much faster than sound |
| B．light travelled much faster than sound |
| C．light had travelled much faster than sound |
| D．light travels much faster than sound |
He told the boys________________.
| A．made so much noise | B．not to make so much noise |
| C．not to made so much noise | D．not make so much noise |
—Do remember to take this medicine three times a day with warm boiled water.
—_____.
| A．Heard it | B．Take it | C．Got it | D．Make it |
Internet shopping will really _____ when people believe that it is safe.
| A．take off | B．take up | C．get off | D．get up |
Some students found _____ hard to study English well .
| A．this | B．it | C．that | D．which |