Correct Answer:
B. run deep
This question requires completing a well-known English idiom. Idioms are phrases whose meaning cannot be understood from the ordinary meaning of its words. The complete idiom is "Still waters run deep."
This idiom means that a person who appears calm, quiet, or reserved on the surface may actually have a very deep, complex, or passionate character underneath. It suggests that appearances can be deceiving and that a quiet exterior can hide profound thoughts, emotions, or capabilities. Therefore, option B is the correct completion.
- A: make no noise, while literally true for still water, is not the idiomatic expression.
- C: bring food and D: smell bad are incorrect as they do not form a recognized idiom or proverb with "Still waters."