Laboratory and Dolphin

Hint: What can I do to help the oily bird?

Hint: What can I do for the gerbil?

Hint: Can I do anything with the aquarium full of oily water?

Hint: What is on the blackboard and the computer?

Hint: Is there anything in here that I can take?

Hint: Anything else I can do here?

Hint: I can't unlock the door!

Hint: What do I do with the dolphin?

Hint: He wants to give me a ride!

Hint: What does he want now?

Hint: What can I do for Delphineus?