Either answer (is, are) acceptable.

Every one of those books (is, are) fiction.

Nobody (know, knows) the trouble I've seen.

(Is, Are) the news on at five or six?

Mathematics (is, are) Jon's favorite subject, while Civics (is, are) Andrea's favorite subject.

Eight dollars (is, are) the price of a movie these days.

(Is, Are) the tweezers in this drawer?

Your pants (is, are) at the cleaner's.

There (was, were) fifteen candies in that bag.

Neither the explorer nor his companions (was, were) ever seen again.

Every year, during the midsummer festival, the smoke of village bonfires (fills, fill) the sky.

Many hours at the driving range (has, have) led us to design golf balls with GPS locators in them.

Neither the professor nor his assistants (was, were) able to solve the mystery of the eerie glow in the laboratory.

Neither Matt nor his brothers (was, were) at the party.

The teacher, along with her students, (is, are) determined to have a good year.

The scissors (is, are) kept in the top desk drawer.

She, against her aunt's wishes, (have, has) decided to go skiing instead.

Three hours (are, is) not going to be enough time to travel that distance.

(Are, Is) Lois or Kate your choice for the promotion?