[MFAW-Q301] Choose the correct word for Subject-Verb Agreement

George is the only one out of all the staff who ___________ actually made the effort to research his proposal.

The finance department, as well as human resources and sales and marketing, ___________ to submit plans to cope with changing economic environment.

Edith said one of her friends ___________ attending the opening celebrations.

We estimate that most of the stock ___________ been destroyed but there ___________ at least 200 crates untouched.

Five years ___________ a long time but we are now profitable.

Company politics ___________ harming the profitability of this business.