In my family, there ____(be) three people. My father is a ____ (farm) and goes to work in the field every day. He isn't good at ____ (talk) but he gets on well with other people. My mother is very kind and is ____ (friend) to everybody. So when I have ____ problem I will turn____ her for help. My friends say I am clever, because when the teacher asks ____ (we) very difficult questions, I can come up with the answers ____ (quick). But my father thinks I am not patient. He says once I have difficulty in ____ (solve) problems, I will ____ (easy) give up. This is what I need to improve in the future.

顺次连接四边形ABCD各边中点，得到四边形EFGH，要使四边形EFGH是菱形，应添加的条件是（　　）