After Rachel had worked for the company for more than 1 0 years, was finally promoted to a managerial position.

Explanation:

You could repeat Rachel's name in the blank, but it really is kind of boring. So that's when you start using pronouns.

After Rachel had worked for the company for more than 1 0 years, she was finally promoted to a managerial position.

51. i'm

52 idk

53. just

the unsaturated fatty acid is a fat consist of one or more double bond in the fatty acid chain. if it contains one double bond then called as monounsaturated fatty acid however if, it contains more than one bonds called as a polyunsaturated fatty acid. true fatty acids are called unsaturated fatty acids as it reduces the risk of high blood cholesterol and good for health.