There's something a bit off about #4. It should be "try once more" not "one more" - just a typo, I think.
But the answer "He will be sleeping" is a bit odd. More likely are: He may be asleep. He may be sleeping. He's probably sleeping. (Although why you want to wake the poor guy up is another question!)
I am not sure I understand your post correctly. Are you proposing some possible answers? This type of exercise requires that students pick one of the four given answers. This doesn't mean, of course, that they're the only possible ones, as other sentences might make sense.
That said, my humble opinion is that your #3 would be possible if it were not for the
I have scored 12/12 ^^ I have got the book and I find it very helpful. By the way, the explanation for the 4th question can be find in the first chapter of the book. It is in a small table when the usage of tenses is explained.