𝘾𝙝𝙤𝙤𝙨𝙚 𝙩𝙝𝙚 𝙘𝙤𝙧𝙧𝙚𝙘𝙩 𝙤𝙥𝙩𝙞𝙤𝙣.
She wrote the date down in her diary ______ she wouldn't forget it.

• so that
• to
• so as not to