短文填空。 When people are free, they like to travel from one place to __ 1 __ .  Some of them travel for fun, some for learning and some for other__ 2 __. One day, a father __ 3 __ his son to the countryside for a trip.  The father wanted to show his son how poor people lived there, so they __ 4 __ a whole week in a poor family.  In the day, they helped the family __ 5 __ on the farm.  At night, they talked with the family and played with the children __ 6 __. When they __ 7 __ back from their trip, the father asked his son, 'My dear son, how was the trip?' 'It was very interesting, Dad!' 'Did you see how people worked there?' 'Yeah!' 'And what do you __ 8 __ ?' 'We have a dog at home, but they __ 9 __ four.  We have a pool in the middle of garden but they have a clean river.  We have some lamps in the garden but they have beautiful stars.  They are a lot __ 10 __ than we!'