In generally, the rule is very simple: a singular subject requires a singular verb.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
The boat was sailing north when a terrible storm_____________ .
Only one of our gifted students______to participate in the final competition.
Supporters of free-market globalization point out that_____________________ .
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
Standing on the tip of the cape,____________________ .
In spite of her abilities, Laura has been_____________________ overlooked for promotion.
We must push the piano to the corner of the hall to_____________________ our party tonight.
I am sorry I have no time at present to____________________ detail of our plan.