July is coming. People all around the world are talking about their____(vacation). Parents would like____(help) their children relax.____ (luck), they have two months off. Some people enjoy quiet life, so many of ____(they) stay at home watching TV, using computers and so on.____some spend time differently. My pen pal Tony ____ blonde hair is a boy from the US. He says that ____(America) like going to the countryside. Just like his big family, they often go to a farm. There, some can feed animals, some can play and ____(other) can watch____ nice sky and rivers. They can also taste delicious food. They are quite _____(interest) in the life there.

已知图形：①等边三角形，②平行四边形，③菱形，④圆．其中既是轴对称图形，又是中心对称图形的有（　　）