Ⅰ、2、They went to the beach.
3、He stayed at home /
listened to music.
4、They visited the zoo.
5、She went shopping.
6、He visited the museum.
Ⅱ、had, cleaned, did, was, took,
visited, had, got, read, saw
Ⅲ、One possible version:
My classmate Jack had a really interesting weekend. Last Saturday moming, he got up early and went to the supermarket with his mother. They bought a lot of delicious food.
On Saturday afternoon, he played basketball with his friends. In the evening, he read a book at home. Last Sunday morning, he with his parents visited his grandparents. They had a big dinner and his grandparents were very happy. On Sunday evening, Jack watched an exciting movie with his friends. He had a very good time last weekend.