When I _________ the past and think how much time has been wasted, my heart bleeds.
| A．look back at | B．look forward to |
| C．look out of | D．look away from |
Though having lived abroad for years, many Chinese still _____ the traditional customs.
| A．perform | B．possess | C．observe | D．support |
When such an organised group became too large for its members to travel together comfortably, it would ______.
| A．hurry up | B．split up | C．make up | D．pick up |
By the time Jack returned home from England, his son _____from college.
| A．graduated | B．has graduated | C．had been | D．had graduated |
Those successful deaf dancers think that dancing is an activity _____ sight matters more than hearing.
| A．when | B．whose | C．which | D．where |
______ many times，he finally understood it．
| A．Told | B．Telling |
| C．Having told | D．Having been told |