Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (silver VARCHAR, year VARCHAR, gold VARCHAR)
### Question:
Who won silver in the year before 2010, the year Chan Ming Shu won gold?
### Answer:
SELECT silver FROM table_name_21 WHERE year < 2010 AND gold = "chan ming shu"