Рашэнне: Заданне 9

Not many people enjoy having their photo taken at a birthday party or special event. However, taking photos could also be damaging our ability to remember special moments: A group of experts (1) ... out an experiment in an art gallery. They wanted to see if people remembered paintings better when they took pictures of them. The first tour guide led one group of people around. As well as learning about the artwork, they were encouraged to take photographs. A second group had the same tour but weren’t (2) ... to use their cameras. The next day, their memory was tested to see how much they could remember about the paintings. Although both groups did well in the memory test, the people who didn’t take photographs remembered more (3) ... to the others. Despite taking photographs, it seems the photographers didn’t (4) ... as much attention to the paintings. So, although they have photographs to look back at, they don’t have the memories.

Какое слово (словосочетание) пропущено на позиции (1)?