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)

1) secretive 2) alphabetical 3) energetic 4) harmful 5) selfish 6) rainy