Ответ:

1 The art gallery has insured itself against theft, fire and damage.

2 I hope you've enjoyed yourselves at the music concert.

3 Many artists like being by themselves when they're working.

4 It is said that Michelangelo painted the Sistine Chapel in Rome all by himself.

5 We must behave ourselves and not touch any of the paintings.

6 John, you must be really pleased with yourself for doing well on that pottery course.

Объяснение:

В задании требуется вставить в пропуски подходящие возвратные местоимения. Это такие местоимения, которые содержат в себе слово "self":

I – myself (я сам)

We – ourselves (мы сами)

You – yourself (ты сам)

You – yourselves (вы сами)

He – himself (он сам)

She – herself (она сама)

It – itself (оно само)

They – themselves (они сами)

One – oneself (сам)