Revise the sentences below by selecting the most appropriate verbs to describe the actions. Click the 'Check Answer' button after revising the two sentences.

Sentence 1

Attempts by researchers at identification of the AIDS virus have met with success; however, attempts at development of a vaccine for the immunisation of those at risk have failed.
AIDS researchers have
the AIDS virus but have failed to
a vaccine that will
those at risk.

Sentence 2

Any departures by the members from established procedures may cause termination of membership by the Board.
If members
from established procedures, their membership may be
by the Board.


(Adapted from Williams, J.M. and Bizup, J. (2014). Style: Lessons in clarity and grace. (11th ed.) Upper Saddle River, NJ: Pearson.)