Here some lateral thinking (ie questions that require you to understand the solution from the clues)
1: If Mary had asked for an ice cream, perhaps her brother would be alive!
Clue: the ice is in the cellar.
2: There are a pipe, a carrot and two buttons on the lawn, why?
Clue: it isn' t murder
3: Daniel is traveling to an important meeting and stops at the hotel but is not sure of waking up, then slightly open the blinds
Clue: she isn' t not in a anacustic room (ie where you do not hear any noise)
4: Marco is a wild great wealth but do not spend it until after 9 months, why?
Clues: he isn' t greedy.
5: In the restaurant "Oasis of the Sailor", after dinner, some people feel bad but did not eat too
Clue: there wasn' t rotten food.

( sorry for bad translate )