2. how to switch language for just three words for correct hyphenation?

3. if the citation in APS format falls out of the right margin, what needs to be changed to adjust it?

4. In APS, I cannot figure out how to make a space appear between the numbers for cited sources. [1, p. 1,2, p. 2]. But [1, p. 1, 2, p. 2] is what is desired. In one case it did appear automatically, but all others don't work.

\cite[righttext={{{, p.~1}},{{, p.~2}}}][book1,book2]