Complete the sentence with the correct words.

I had come to find out the secret of these healthy islanders’ longevity and a stroll down to the waterfront with Makato provided me with my first clue. After passing elderly fishermen unloading the day’s catch, Makato joined a queue at a market stall to buy fish for the evening meal. It seems the people of Okinawa eat plenty of fish, ...

• which is a healthy food and very low in calories.
• who also looked younger than her 76 years.
• since my arrival in Okinawa.
• who has studied Okinawa’s centenarians for more than a decade.
• which the Okinawans firmly believe helps to prevent illnesses.
• that the family only ate small portions.
• which is not at all unusual in Okinawa.