Solve it a. increases/their / it / rating /t. v /time / in / prime. b. every / four / hours / the / fast / take / liquids / during. c.the fast / grapes / is / recommended / and /orange / during / juice /of / lemons.

a. It increases their rating in TV prime time.

b. Take liquids every four hours during the fast.

c.  Juice of orange, lemons and grapes is recommended  during the fast.

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explanation:

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it is an infinitive phrase with a subject.