Here are the correct answers for the questions based on the passage:

1. C. hold
2. A. biggest
3. A. number
4. B. kind
5. A. take
6. D. perform

So the completed sentences would read as follows:

1. Five out of seven festivals (1) **hold** place all at once during that time, and the biggest one is the Edinburgh Festival.
2. The Edinburgh Festival, which is also called the Fringe, is the world’s (2) **biggest** arts and culture festival!
3. During the three weeks of the festival, Edinburgh attracts a great (3) **number** of tourists from all over the world coming to see all the talented artists and musicians.
4. There are a (4) **kind** of shows for people of all ages and tastes, for example, dance shows, music concerts, art exhibitions, comedy shows, and the list goes on!
5. If you find it hard to decide what to (5) **take**, come to the Royal Mile - the main street for tourists.
6. There are always bands, singers and comedians who (6) **perform** for free at most hours.