选词填空： pastime | straightforward | souvenir | unintentionally | gems Most road signs you come across are____1____. [填空1] They tell you what to do, which direction to go in, where you are, etc., but occasionally (and usually ____2____ [填空2] ), road signs can be funny! Taking pictures of funny road signs while traveling is a favorite ____3___ [填空3] for many travelers. We've all come across these ___4____ [填空4] : a miswritten translation; an unusual warning; or an illustration that just doesn't seem right. It might be an official highway sign or something written on a shop window.  All are perfect for adding to your travel photo album and sharing with friends. And oftentimes, photographic evidence of such a sign not only makes a great ___5____ [填空5] , but also serves as proof for doubtful folks back home.