A variety of butterflies ________ flying in the jungle, one of which is a very rare one.

A. is              B. have been         C. are            D. has been

A variety of books _____________ the children of different ages.

. A variety of courses ________ offered to enrich the students’ background knowledge of the English-speaking countries.

A variety of books ______ the children of different ages.

A. are intended for　 　 B. is intended for 　　 C. are intended for　 　 D. is intended for

A variety of books _____________ the children of different ages.

1. A.
   are interested in
2. B.
   is interested in
3. C.
   are intending for
4. D.
   is intending for