完成句子：(共5小题，10个空，每空1分，满分10分)

小题1:When the war ______  ______ (爆发), he was working in the navy.

小题2:I can’t ______  ______(想出)why she said that.

小题3:______  ______he is free will he come to see me.

小题4:______  ______ a good teacher, John made great progress in his English study last term.

小题5:If I have a choice I would ______  ______ choose something else.

使用克令吊前首先要做的是工作是：（）

A.打开水密门通风

B.检查刹车情况

C.升起吊臂，仰角应大于15度

D.松开刹车