Every year the Greens go to the beach for a week's vacation. There are many interesting things to do at the beach. The children play games on the sand. Sometimes they build sandcastles  . There are saltwater   swimming pools. The children can swim safely in these pools and the water is always clean. There is an esplanade  . This is a long road by the beach. There are many cafes   and restaurants on the esplanade. There is also a park beside (......) the beach. This is a place that many people like to go to. The Greens always stay at the same hotel. They usually have the same rooms. These rooms are at the front of the hotel. There is a good _ of the sea from their windows. The children are a little sad when the vacation is over because they don't want to leave. How often do the Greens go to the beach?
Once a year. Once a week. Twice a year. Every a half year.