If people (stop) ... Using dynamite for fishing, a lot of sea creatures (be) ... well preserved

put the verbs in bracket into the correct tense
1 if people (stop).... Using dynamite for fishing, a lot of sea creatures (be)... well preserved
2 we (live)... a happier and healthier life if we (keep)... the environment clean and polluted
3 unless he (study)... hard, he(not fail) the final exam
4 if they (leave)... now, they(not be)... late
5 the sea (get)... warmer if the earth (get)... warmer