Помогите плез упражнение 5 и 6

5: 1 - b 2 - a 3 - b 4 - a 6: 1 - Ann has been writing a letter for five o'clock 2 - They has been tolking for the morning 3 - It has been raining for one hour 4 - She has been cooking dinner when we come 5 - He has been making a fire for 20 minutes 6 - I has been taking pictures for two hours