Так как все предложения стоят в Present Continious, то начинаем с королей Is и Are.
1. Is there a nice picture on the table?
2. Are there a lot of postcards on the table?
3. Is there a new computer in the room?
4. Are there a lot of old things on the pantry?
Надеюсь я помог вам, Удачи :)