To complete the text, you need to fill in the blanks with the appropriate forms of the words in parentheses. Let's go through each blank one by one:
OLD: The sentence should read, "Alison was 15 years older than me and she always treated me like a child." Here, "older" is the comparative form of "old" used to compare Alison's age with the speaker's age.
MAKE: The sentence should read, "The box was made of wood and had colourful stones on the top." Here, "was made" is the correct past passive form, indicating that someone made the box from wood.
ALLOW: The sentence should read, "If the box was mine, I would allow you to touch it whenever you wanted." Here, "would allow" is the correct conditional form, indicating what the speaker would do if they owned the box.
FOOT: The sentence should read, "She moved gracefully as if her feet didn’t touch the ground." Here, "feet" is the correct plural form of "foot".
NOT/CAN: The sentence should read, "I tried to resist my curiosity but I couldn’t." Here, "couldn’t" is the contraction of "could not", indicating the speaker's inability to resist their curiosity.
BE: The sentence should read, "There were lots of rings, ear-rings, bracelets and necklaces inside." Here, "were" is the correct past tense form of "be" to agree with the plural noun "lots of rings, ear-rings, bracelets and necklaces".
ONE: The sentence should read, "The first piece of jewelry I tried on was a silver necklace." Here, "first" is the correct ordinal form to indicate the sequence of trying on the jewelry.
SEE: The sentence should read, "Suddenly I saw Alison." Here, "saw" is the correct past tense form of "see".
NOT/KNOW: The sentence should read, "I didn’t know what to say." Here, "didn’t know" is the correct past tense negative form to indicate the speaker’s confusion or inability to speak.
So, the complete text with the correct words filled in should read:
"I was sitting in an arm-chair and watching my sister Alison. She was getting ready for a party. Alison was 15 years older than me and she always treated me like a child. Alison took her jewelry box from the table. The box was made of wood and had colourful stones on the top. 'You know you must never touch it, right?' Alison said. 'If the box was mine, I would allow you to touch it whenever you wanted,' I answered. Alison said nothing to that. When she put on her jewelry, she looked like a princess. She moved gracefully as if her feet didn’t touch the ground. Alison kissed me goodnight and left. I tried to resist my curiosity but I couldn’t. I opened the box. There were lots of rings, ear-rings, bracelets and necklaces inside. I got them all out. The first piece of jewelry I tried on was a silver necklace. After that I lost track of time. Suddenly I saw Alison. She was standing at the doorway and looking at me angrily. I didn’t know what to say. Many years have passed since that night. Now I am a designer – I create clothes and accessories. My sister likes my work very much."