Question

some room give a beautiful view of the valley. But _______are all booked.​

Answer 1

Answer:

Some rooms give a beautiful view of the valley. But they are all booked.​

  Since it is plural ( rooms), we use they.

       Hope it is helpful. Take care.

Answer 2

Answer:

they is the correct answer

Some room give a beautiful view of the valley. But they are all booked.​

hope it helps

have a good day :)