Quizzes: Subject Verb Agreement 2

For each of the following questions, determine whether the verb should be singular (ending in -S) or plural (not ending in -S) in order to agree with its subject.
1) Each of the illuminated manuscripts in the library's collection (was/were) unique, although most contained similar groups of texts accompanied by vividly colored decorations.

 
2) Along with the traditional colonial structures that are characteristic of New England, pioneering examples of modernist architecture (has/have) also been targeted by preservationists.

 
3) One of The Tale of Genji's most extraordinary features (is/are) its ability to maintain internal coherency while describing the lives and actions of more than 400 characters.

 
4) During the American Revolution, the political relationship between the British, the colonists, and members of the Cayuga tribe (was/were) shifting and complex, with most Native Americans electing to side with the British.

 
5) A recent project undertaken by a group of naturalists (uses/use) color as a means of piecing together evidence of how genetic diversity occurs within animal populations.

 
6) The theme of conflict between social classes (has/have) inspired generations of writers from Elizabeth Gaskell in the nineteenth century to George Orwell in the twentieth.

 
7) According to researchers, knowing two or more languages (increases/increase) one's ability to focus in the face of distraction and ignore irrelevant information.

 
8) The isolated environment of a shipwreck can create conditions in which low temperatures and a lack of oxygen (preserves/preserve) organic matter for centuries.

 
9) Caffeine is toxic at sufficiently high doses, but consumption of foods containing small amounts (poses/pose) few known risks to health and may even offer modest protection against some types of disease.

 
10) Included among Annie Easley's energy experiments (was/were) studies to determine the life use of storage batteries, such as those used in electric utility vehicles.