—Remember that where and when two different English question words___________. —I see, but can you tell us how to use them, sir?

 -- “____either you or he to go there?” --“_____is.” 

When and where to go for the on-salary holiday ______ yet.

--Why does the lake smell terrible?    ---Because large quantities of water ______.

 Physics _______ an easy subject for me when I was young. I usually got high marks then.