Read the following paragraph and underline the topic sentences.
The best place for me to forget all my worries is under a palm tree at dusk. When I am worried about a problem or just want to be alone, I will go to the beach around six in the afternoon and sit in the shade of a palm tree. The sand is a little hard to sit on, but this does not bother me. As the wind blows like a whistle, and the waves become softer as they reach the shore, the air will have a slight smell of the sea. The pelicans pass in groups of seven before disappear behind the horizon. Others float on the water, hoping to catch a fish before leaving. As time passes, there is an immense silence; the sun begins to descend, and the sky changes from tones of dark blue, to canary yellow and finally to deep orange. How beautiful the nature is! All my worries are gone.