Choose the correct form of the word in brackets

Choose the correct form of the word in brackets: The scientist's ______ (discover) of a new element was groundbreaking and received international acclaim.
a) discovery b) discover c) discovering d) discovered

Choose the correct form of the word in brackets: The manager was impressed by her ______ (efficient) in completing the project ahead of schedule.
a) efficiency b) efficient c) efficiently d) inefficient

Choose the correct form of the word in brackets: His speech was so ______ (inspire) that the audience gave him a standing ovation.
a) inspiring b) inspired c) inspiration d) inspirational

Choose the correct form of the word in brackets: The ______ (maintain) of the old castle requires a significant amount of funding each year.
a) maintenance b) maintain c) maintaining d) maintained

Choose the correct form of the word in brackets: The company’s recent policy changes aim to improve employee ______ (satisfy) and productivity.
a) satisfaction b) satisfy c) satisfying d) satisfied