crops, corps, corpse — 1. What are the benefits of growing GM crops? 2. The volunteer corps was organising a blood donation camp. 3. He was sleeping like a corpse. In which of the sentences given above has/have the word(s) been used correctly?

'Crops' refers to cultivated plants or agricultural produce - correctly used in sentence 1 about GM crops. 'Corps' refers to an organized group of people - correctly used in sentence 2 for a volunteer corps. 'Corpse' refers to a dead body - the idiom 'sleeping like a corpse' (meaning sleeping motionless) is used correctly in sentence 3. All three sentences use the words correctly.