There are no commas in that sentence. A comma is only used to separate clauses when coupled with a conjunction, or in listing.
Answer:
The action slows when Annie and Anagnos have a discussion, and the play becomes boring.
Explanation:
This is not someting that they should include in a summary. Instead it should be replaced by what Annie and Anagnos are talking about for an effective summary.
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Answer:
Bartolommeo Cristofori, a Paduan harpsichord maker, is credited with constructing the first piano, the date usually put at between 1709 and 171 1. He called his new instrument gravicembalo col piano e forte, or harpsichord with soft and loud.
Explanation: