(2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.
A．while B．when
C．as D．before
(2013·成都第一次诊断)Actually, the London Olympic Park is built ________ there used to be a poor area called East London.
A．what B．when
C．where D．why
(2013·厦门第一次质量检查)You had better book rooms at the hotel in advance ________ you should find no room on your arrival.
A．so that B．even if
C．in case D．now that
(2013·济南一模)________ you are unable to deal with it, perhaps we should ask someone else for help.
A．Although B．While
C．Since D．Unless
(2013·青岛一模)You seem to have a readymade answer ________ I ask you a question.
A．whenever B．whatever
C．whichever D．whoever
(2013·日照一模)—What has made John look like lacking sleep?
—________ he had to prepare for the coming exam and stayed up last night.
A．For B．Because
C．That D．What
