Explanation

The correct idiom to replace "completely defeated" is: "Root and branch." 

The idiom "root and branch" means to destroy or eliminate something, leaving no part remaining

Explanation

 "Under a cloud" means being under suspicion or doubt.

Explanation

The correct sentence is: "Oh, I forgot my keys." 

"Oh" is a common interjection used to express surprise, which fits the context of suddenly remembering the forgotten keys.

It is properly followed by a comma, as interjections are typically separated from the rest of the sentence.

Explanation

"Agree with" is the correct phrase to replace "follow you" in the context of agreeing with someone's point of view.

Explanation

The sentence "If it rains, we will stay home." is correct because it uses the first conditional, which is used for real and possible situations in the future.

The structure is:

If + present simple, will + base verb.

It implies that if the condition (rain) happens, the result (staying home) will follow.

This conditional expresses a likely scenario that may happen in the future.

Explanation

 "They had eaten dinner before the movie started" is in the past perfect tense 

it indicates a completed action before another past event

indicate an action (eating dinner) that was completed before another action (the movie starting) in the past.

Explanation

"Most of the floor had been covered by the rug" is the correct passive voice transformation.

Explanation

"Deals in" is the correct phrase used when someone is engaged in a trade or business.

Explanation

 "Took" is the correct past tense of the verb "take," which is appropriate for the sentence.

Explanation

"Jury" is a collective noun as it refers to a group of people acting as a single entity.