Choose the correct alternative. 1 The letter arrived/was arriving when I was having breakfast. 2 I sat/was sitting outdoors when it started to rain. 3 The students were talking when the teacher appeared/was appearing. 4 My dad was making the dinner when I got/was getting home from school. 5 When I went out this morning, the sun shone/was shining. 6 When my brother was playing with the ball, he broke/was breaking a window.