One of the first foreign expeditions _______ Mount Qomolangma arrived in Tibet in 1921.

______ turned out that an army officer set off the bombs．

—— Why did he let you repeat his instruction time and time again? —— ＿＿＿＿＿＿that I remember what was＿＿＿＿＿after he went out. 

 Has ________ 　been decided when we are to hold the sports meeting? 

Normally, a forest fire and the damage ______ causes can be very severe, especially when you consider the financial and physical losses.