Several weeks had gone by _____ the head of the gallery realized the painting was missing.
| A．after | B．before | C．since | D．that |
Years of war has left the country _____.
| A．in fear | B．in silence | C．in peace | D．in ruins |
In that train accident, _____ who were killed was more than 2000.
| A．a number of people | B．the number of people |
| C．many people | D．a large number people |
At the sight of the _____ scene, he was almost _____ to death.
| A．frightened；frightened | B．frightening；frightened |
| C．frightening；frightening | D．frightened；frightening |
Tell me the reason _____ you are late.
| A．that | B．why | C．which | D．where |
The boy _____ mother was ill could not come to school.
| A．who | B．whose | C．which | D．whom |