After living with his grandparents in the countryside for ten years, the boy returned to the big city ____ his parents worked.
| A．which | B．where | C．that | D．when |
Strong sandstorms are often _____ you cannot see the sun.
| A．so thick that | B．such thick that | C．thick in order that | D．thick such that |
He then moved to London, _____ he became famous.
| A．which | B．when | C．where | D．why |
One third of the class _____ agreed to be volunteers to help the aged this vocation.
| A．are | B．is | C．has | D．have |
It’s been years since I _____ myself so much.
| A．enjoy | B．enjoyed | C．have enjoyed | D．had enjoyed |
— We’ll go to climb the moutain this weekend. Would you like to join us?
— _____
| A．That sounds fine to me. | B．It’s really hard work. |
| C．What do I need to prepare? | D．What may I expect? |