Like and as

1. Like and as.

1. ...and lifted his head, dreamily, as one who has drunken...
2. He lifted his head from his drinking, as cattle do,...
3. And as he put his head into that dreadful hole...
4. ...he had come like a guest...he seemed to me again like a king...

as = in the role of, in the form of; a preposition followed by a noun (1)
as = in the way that; a conjunction followed by a clause (2)
as = when, while; a conjunction followed by a clause (3)
like = similar to; a preposition followed by a noun (4)

Choose either as or like to complete the sentences.