Which is the verb in this sentence?

My favorite book is Greek Mythology by Edith Hamilton.

Bread and butter _____ a breakfast staple in many countries.

Complete the following sentence. A headache, accompanied by sniffles and sneezing, _____ a symptom of the flu.

Complete the sentence: "Neither the buyers nor the sales manager _____ in favor of the system".

The team _____ to continue their winning streak at the annual events.

Five thousand pesos _____ a lot of money to spend in a day.

Some of the sugar _____ on the floor.

Everybody _____ to eat an apple a day.

Some of the marbles _____ on the jar.

Which verb agrees with the subject in terms of number.

"The people who listen to Indie music _____ few."

Which sentence is incorrect?