1, The water was so dirty that we decided not to go swimming
2, I was so tired that I went to bed at 7o'clock
3, the house was so old that we couldn't be in
4, the movie was boring, so we went home before it finished
5, the air was so fresh that we decided to stay for a long time
6, the weather was cold, so we had to cancel our picnic
7, some of the books are important, so we must read them
8, the story of ancient greece was boring, so it made me sleep
9, this coat is so thin that i can't wear it
10, the tale story is so exciting that we want to hear it again
11, it was a public day, so all the shops were shut
12, the weather was bad, so we didn't enjoy our holiday
13, she is working late next sartuday, so she can't come to the party
14, i want to play computer games, so i bought a computer
15, we don't use the car very often, so we've decided to sell it
16, the house was empty, so we left a note..
17, tony want to see the ET, so he went to Paris
18, she was hungry, so she had a big lunch