Ms. Smith lived in a small village. She was born with a silver spoon. When her parents died， they left her a lot of money. After that， she lived on her own. Unfortunately， she became blind after a serious illness. She went to see lots of famous doctors， hut nobody was able to cure her eyes. She felt very sad.

    One day, a man named Tom came to the village where Ms. Smith lived. He heard about her illness and came to her house. He told Ms. Smith that he had much experience. He was sure to cure her eyes. But she must pay him a large amount of money. Ms. Smith agreed. “But you can't get a penny if you fail，" said the lady.

    During the treatment， Tom found Ms. Smith was very rich. There were plenty of good thing in her house. He stole many valuable things from the house. Several weeks later， Tom cured Ms. Smith. The lady could really see with her eyes. When Tom asked for moneys. Ms. Smith refused. She said. '*You haven't cured my eyes. Before I was blind， I could see all the things in my room.    ⑸     ”

Hearing that， Tom stood there and couldn't say a word.

四用方框中所给单词的适当形式填空。（有两个单词是多余的）

已知函数f（x）=sinωx（ω＞0），若y=f（x）图象过$\left(\frac{3\mathrm{\pi }}{4},0\right)$点，且在区间$\left(-\frac{\mathrm{\pi }}{4},0\right)$上是增函数，求ω的值．