6) Does she eat lunch at the cafeteria every day?

She doesn't eat lunch at cafeteria every day.

7) Does the receptionist speak English very well?

The receptionist doesn't speak English very well.

8) Does the manager solv all the problems?

The manager doesn't solv all the problems.

9) Do they they live in a double room?

They don't live in a double room

10) Do you/I have a letter of confirmation?

I don't have a letter of confirmation.

11) Is it a reasonable price for such a room?

It isn't a reasonable price for such a room.