Hi,
(a) The owner found out and thanked Ali for his bravery.
(b) They knew the house owner was away for a week.
(c) He called the police for help. The police arrived and caught the thief red-handed.
(d) The owner of the house thanked and praised Ali, who had done a good deed.
(e) The house owner found out Ali saved his house, so he thanked Ali a lot.
(f) The police had arrived at the scene just in time.
Clive