I think the answer would be adds because it is present tense
Answer:
Stephano cannot communicate clearly with Caliban because of his accent, whuch makes him angry. ... Stephano sees Caliban's language abilities as threat and makes plans to subdue him.
1) A pickpocket stole his wallet
2) The scorching sun was unbearable
3) The crowded train screeched to a halt
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I hope this helps!
- Kana