1 When did you receive a letter from Lan ?
2 When does Minh usually take exercises?
3 How often do you brush your teeth?
4 What time does Nga have English this morning?
5 What time does she often go to bed?
6 When did you begin to study English?
7 Where do they live?
8 Why do you like " Tom and Jelly"?
9 Who you went to disco with last night?
10 What is she worried about?