Please would a native tell me if these are natural?<br/><br/>1 <br/><br/><i>The prices in this city can't drop any more than they already have.</i><br/><br/><i>The prices can't go up any more than they already have.</i><br/><br/>2 <br/><br/><i>When work is slow as a photographer, I work as a temp.</i><br/><br/>3 <br/><br/><i>I use the word when it's suitable/appropriate.</i><br/><br/>4<br/><br/><i>She knows when people are looking at her/when people look at her.</i><br/><br/>5 <br/><br/><i>It's not up to me to decide whether/if you should take it or not.</i><br/><br/><i>Thank you</i>