D: their
This makes more sense than his. There is more than one person being referred to in the sentence. the word solo is referring to Joe and Daune.
I tried putting his in the sentence and it just doesn't make sense to me. If the sentence was like the following: Joe was not nervous about___his __ solo in the concert then I think it would make more sense to use this word.
Hopefully this helps and good luck. :)
P.S. Don't you mean: Neither Joe nor Daune were nervous about __their __ solo in the concert? Were makes more sense than was.
(1) The prefix root word of megalithic is mega, suggesting that the monument is large, complex, or has several uses. (2) This root word is also used in words like the following, even though it may have a slightly different meaning: megaphone (using the root word to mean loud), megahit (using mega as to mean well-known), and megabyte (using the root word to once again mean large). Two other prefixes you could use to mean large are maxi and macro. these are used in words like maximum and macrobiotic.
Answer:
After reviewing all the studies and research that's out there, here's my best advice: Take SHORT breaks – say 5 to 15 minutes – every hour or so. Take a longer break – at least 30 minutes – every 2 to 4 hours (depending on your task)