My hobby is swimming.I ?... up this hobby 5 years ago 1) take 2) took 3) am taking

To complete the sentence correctly, you would use the past form of the verb based on the context provided. Since the sentence indicates the period of starting the hobby in the past (5 years ago), the correct choice in the given options would be:

2. took

Therefore, the completed sentence would be: "My hobby is swimming. I took up this hobby 5 years ago."