Ответ:

1)I think we should go to Spain instead of Australia.

2)You ought to try to visit Scotland.

3)My mum was very busy at work,but should take a short holiday over Christmas.

4)In some countries you need not pay to visit public museums

5)Last year i was able to visit England twice.

6)Do you know if we must have visas to go to the Caribbian?

7)We need not book the tickets. We will go on a package holiday.

8)Passengers must not carry more than one piece of hand luggage onto the plane