【正文】
heir son, is looking at a plane in the sky. Mary, their daughter, is walking behind her parents. She is looking at fish in the lake, too. ( ) l. It39。s a fine day today. ( ) 2. Mr. Green and his students are in the park. ( ) 3. Torn is looking at a plane in the sky. ( ) 4. Mary is sitting behind her parents. ( ) 5. Mary is looking at the fish in the lake, too.