Fill in the correct word derived from the word in brackets. 1 He is very nobody knows about his scientific experiment. (SECRET) 2 This is a list of marine animals in order (ALPHABET) 3 The athlete is very and loves to train at the gym. (ENERGY) 4 Acid rain is to the environment (HARM) 5 David is so he doesn't think about anyone else but himself. (SELF) 6 They usually stay home on days. (RAIN)

He is very secretive; nobody knows about his scientific experiment. (SECRET → secretive)

This is a list of marine animals in alphabetical order. (ALPHABET → alphabetical)

The athlete is very energetic and loves to train at the gym. (ENERGY → energetic)

Acid rain is harmful to the environment. (HARM → harmful)

David is so selfish he doesn't think about anyone else but himself. (SELF → selfish)

They usually stay home on rainy days. (RAIN → rainy)