This really is a nice book: sentences and selections are arranged according to the chapter of Wheelock's Latin, going along with the pace of the textbook's difficulty and introduction of vocabulary.
If You Must Wheelock…
A Primer of Ecclesiastical Latin by John F. Collins
First off: NOT FOR LATIN NEWBIES! This is a very fast-paced course. If you have no previous Latin experience, you should start with another text. It's called a Primer of Ecclesiastical Latin, and technically it is, but it is not good for use as a primer for learning Latin--so caveat emptor!
Getting Started with Latin by William E. Linney
This is a perfect guide to the very basic first steps of Latin, particularly for the fearful beginner.
Learn Church Latin 