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 |
Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.(2011·江西)
| A．whenever | B．however |
| C．whichever | D．wherever |
—How is your recent trip to Sichuan?
—I've never had ________one before.(2011·四川)
| A．a pleasant | B．a more pleasant |
| C．a most pleasant | D．the most pleasant |
Mr.Stevenson is great to work for ——I really couldn't ask for a ________ boss.( 2011·全国Ⅱ)
| A．better | B．good |
| C．best | D．still better |
Sarah pretended to be cheerful，________nothing about the argument.(2011·全国Ⅱ)
| A．says | B．said | C．to say | D．saying |
________ that they lost the game, tears came down Kate's face.
| A．On hearing the news |
| B．When heard the news |
| C．The moment she heard the news |
| D．While hearing the news |