Dear teacher,<br/><br/> I have some sentences. Please tell me if they are correct:<br/><br/> 1. Which did you put it on?<br/><br/> On which did you put it?<br/><br/> 2. Which desk did you put it on?<br/><br/> On which desk did you put it?<br/><br/> 3. On what desk did you put it?<br/><br/> 4. Whose do you rely on?<br/><br/> On whose do you rely?<br/><br/> 5. Whose son do you rely on?<br/><br/> On whose son do you rely?