18.It was Sunday morning.The weather was fine.Lucy and Mary were playing in the park.Suddenly,they saw a beautiful bird on the grass.Lucy looked around.There was no one nearby.She quickly walked to the bird and wanted to catch it.Mary said, "We shouldn't catch birds here.They're our friends." Then a park keeper came.He pointed at the sign on the grass and said, "Look at the sign.It means you can't walk on the grass." (1)It was a sunny day.
(2)Lucy and Mary were in the zoo.
(3)They saw a beautiful bird on the grass.
(4)Mary wanted to pick some flowers.
(5)The sign on the grass means we can't catch birds.