A）bright B）filled with C）exactly D）worried about E）immediately

The scientist felt sad deep in her heart．She （50） 　　the ocean animals as she walked back to the beach．But when she got there，a group of students and teachers from a local primary school were carrying bags of rubbish to the bins．They had spent their afternoon cleaning the beach!She was （51） 　　joy．

As she spoke with the teacher，the students gathered around them．With （52） 　　smiles on their faces，they shouted，"We must do something to protect the ocean!"

"That's（53） 　　right，"agreed the scientist，as she smiled at their kindness．