Could you please check these.<br/><br/>1. Which classroom is the art lesson taught at? It is taught at 3C room on the 3rd floor.<br/><br/>2. Which classroom is the art lesson taught in? It is taught in 3C room on the 3rd floor.<br/><br/>1. How about we stay in the Merlin hotel tonight?<br/><br/>2. How about we stay at the Merlin hotel tonight?<br/><br/>Are they all acceptable? Are there any differences in meaning? Cheers Fulvio