Question

They kill crocodiles for their skin. 
1.A lot of crocodiles are killing for their skins.
2.A lot of crocodiles are been killed for their skins.
3.A lot of crocodiles were killed for their skins.
4.A lot of crocodiles are killed for their skins.​

Answer 1

Answer: 4. A lot of crocodiles are killed for their skins.

Explanation: Between all answers, 3 and 4 made the most sense. In answer 3 they used the word "were" instead of "are", which is past tense. However in the sentence "they kill crocodiles for their skin" they aren't using past-tense. Therefore 4 is the correct answer.

Answer 2

Answer:

A lot of crocodiles are killed for...