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1. 
Vaccinations _____ (are required) for entry to kindergarten. (often)
2. 
One of the first vaccines _____ (was invented) in 1776 by Edward Jenner, a British country doctor. (originally)
3. 
A milkmaid _____ (was heard) to say that she would never develop smallpox because... (reportedly)
4. 
... she _____ (was infected) with the cowpox virus. (already)
5. 
Jenner understood the significance, and thanks to him, a vaccine for smallpox _____ (was discovered). (fortunately)
6. 
Jenner's smallpox vaccine _____ (is being used) today,... (still)
7. 
... but his work _____ (was not recognized). (initially)
8. 
However, smallpox vaccines _____ (were used) around the world. (increasingly)
9. 
... when the disease _____ (was eradicated). (eventually)
10. 
The last case of smallpox _____ (was recorded) in 1977. (finally)
11. 
While vaccines _____ (are not being developed) for every disease,... (currently)
12. 
... they _____ (have been approved) for many life-threatening ailments. (already)
13. 
As a result, children _____ (are being protected) form disease, which has to be anything but a nuisance. (effectively)