(2013·東北四市一模)After visiting Harbin, most of the foreign friends said they would never forget the time ________ they had spent.

A．that B．what

C．when D．at which

(2013·河北高三教學(xué)質(zhì)量檢測)Many people tried to leave the country, ________ there was much violence and a serious shortage of food supply.

A．where B．which

C．that D．what

(2013·江西撫州五校高三一模)The most impressive sites of Chishui Danxia are its various waterfalls, ________ the Shizhang Waterfall is the largest one.

A．for which B．in which

C．from which D．of which

(2013·四川省巴蜀名校一模)Everyone is different and that is ________ makes our world much better.

A．that B．which

C．who D．what

(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

(2013·青島一模)You seem to have a ready?made answer ________ I ask you a question.

A．whenever B．whatever

C．whichever D．whoever

(2013·濟(jì)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·廈門第一次質(zhì)量檢查)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·成都第一次診斷)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

(2013·四川省樂山一模)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