1.A:LOOK!mr.and mrs.hoang have missed the bus again
B:oh no!they....
2.A:i'm afraid i've lost my key again
B: not again ! you
3.A:the car has broken down again
B: the car is useless !it
4.A:look!you've made the same mistake again
B:oh no , not again !i

II. 
1.the house belongs to my uncle . it is built of wood
2. the picture won the first prize in the art contest. it was taken by his brother
3.the girl is intelligent. she sits next to me
4.the boy is my neighbor's scn.he is playing in the front yard
5.the man was taken to the local hospital . he was injured in the accident