and if all else fails, work.

Oh you poor dear . I know that feeling, when all you want to do it bounce around AWAD and there is your boss hovering around your desk.

You have to practice the "concerned attention to a vital piece of information" look. Scrunch your eyebrows together while peering intently at the screen. Every four or five seconds press on "Caps Lock" a couple of times to make is seem as if you are moving through the document.

It may happen that somebody will, after hovering around for a couple of minutes and not wanting to wait anymore, say "er, Bingley old chap."

Then you move to the "oh all right let me just mark my spot since what you have to say is soooo important" move by doing the 'just one second' sign in a somewhat distracted way, with one hand holding up one finger just barely higher than your mouse - that'll prove you are so very concentrated in your work and they'll usually say "let me come back later". To which you just nod your head without taking your eyes off the screen.

Just a suggestion of course
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I usually play Sherlock while waiting for page turns.