They are all possible, but some are more likely than others. For example, "This medicine works" is fairly unremarkable, whereas "Love comes" would need a special setup to work. The underlined part is not necessarily assumed.
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GPYThey are all possibleAh. All the sentences from my examples without underlined parts can stand by themselves? (grammatically okay despite its unnaturalness if there's no underlined part like you said "Love comes" would need a special setup to work, right?)
moon7296Ah. All the sentences from my examples without underlined parts can stand by themselves?Grammatically, yes (with, as you say, the earlier caveats about how realistic they are in practice).