Rewrite the sentences, beginning as available

rewrite the sentences, beginning as available.
1. the woman was so poor that she needs everyone's help.
-> It
2. He had a difficult exercise. He couldn't do it.
-> It
3. The speaker gave a long talk. Most of the audience felt sleepy.
-> The talk
4. We watched an exciting competition. We didn't want to go home.
-> The competition
5. It was an excellent show. We all enjoyed it.
-> the show
6. his letter was rude . i didnt know what to think
-> his letter
7. the train was so slow . it would have been faster to walk
-> it