Equestrian enthusiasts predict that the alleged abuse of anabolic steroids among horse trainers would subside as long as the testing of the animals is more random and more rigorously enforced

1. would subside as long as the testing of the animals is more random and
2. would subside if the testing of the random animals were
3. will have subsided when testing of the animals is more random and
4. will subside if random testing of the animals were
5. will subside if the random testing of the animals is