阅读理解，判断正误。

Yesterday was Sunday. It was a fine day. The sun was shining. The sky was blue. Mike got up at six. He watered the flowers and did some exercises. Then he woke Helen up. An hour later, they went to the Beihai Park by taxi. The park is very beautiful. They had lunch on the grass. The they went boating. Mike rowed well, but Helen rowed faster than him. They rowed for a long time. They went back at 4:30. After they got home, they helped their mother with housework. They had a good time yesterday.