Prepositions 'in, on, at' of places

They are sitting ​​ (a)   the table.

• at
• in
• on

I want to spend a year ​ (a)   Barcelona.

• in
• on
• at

The milk isn't ​ (a)   the fridge. Where is it?

• in
• on
• at

Is Peter's office ​ (a)   the first or the second floor?

• on
• in
• at

Why are all these clothes ​ (a)   the bed?

• on
• in
• at

Please, put the clothes ​ (a)   the wardrobe.

• in
• at
• on

Are you ​ (a)   home?

• at
• in
• on

I don't want to see her ​ (a)   the party tonight.

• at
• in
• on

I like the sea, but I prefer swimming ​ (a)   a swimming pool.

• in
• on
• at

Please, call me when you are ​ ​ (a)   the bus.

• on
• in
• at