Up to Tuesday's attack, the worst school shooting in the U．S．was in March 1998 in Jonesboro, two boys, aged 11 and 13, shot and killed a teacher and four girls．
| A．while | B．where | C．when | D．then |
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-Pity you missed the lecture on nuclear pollution
.
-Iit, but I was busy preparing for a job interview.
| A． | attended | B． | had attended |
| C． | would attend | D． | would have attended |
It was April 29,2011____Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
| A．that | B．when | C．since | D．before |
Last month, the Japanese government expressed their thanks for the air theyfrom China.
| A． | receive | B． | are receiving | C． | have received | D． | had received |
Born into a family with three brother, David was ____to value the sense of sharing.
| A．brought up | B．turned down | C．looked after | D．held back |
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