21.   If trouble breaks out, the unidentified agents can call on the police for help.

22.   In addition, many sites for insurance carriers have an agent call the customer directly with the quote after the forms have been completed online.

23.   In an important discovery about the nature of mysterious disease agents called prions, researchers have reproduced a crucial step in the infection process in the test tube.

24.   Instead, she has stuck with her three freshman roommates, who used to kid her when her agent called.

25.   Instead of looking into the potential security lapse, the ticket agent called airport security to arrest Lewis.

26.   My agent called me and told me to read it.

27.   My agent called.

28.   No agents called.

29.   No agents call.

30.   On urging, the agent called Italy and the pool indeed was incomplete.