She spoke slowly so that everyone could understand her.
No error. So that + clause correctly expresses purpose.
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Owing to heavy rainfall, several trains were delayed.
No error. Owing to is correctly followed by the noun phrase heavy rainfall.
Because the server was temporarily unavailable, the deadline was extended.
No error. Because correctly introduces a clause giving the reason.
In spite of having very little time, she completed the assignment accurately.
No error. In spite of can correctly be followed by a gerund phrase.
Despite the weather was extremely bad, the rescue team continued its operation.
Despite is a preposition and cannot directly introduce a finite clause. Correct: Although the weather was extremely bad... or Despite the extreme…
The audience was amazed by the accuracy of the young participant's calculations.
No error. Amazed correctly describes the audience's reaction.
The employees were exhausted after working for twelve hours.
No error. Exhausted describes the employees' condition after prolonged work.
She was embarrassed by her mistake during the presentation.
No error. Embarrassed correctly describes her emotional state.
We were disappointed with the quality of the service.
No error. Disappointed correctly describes the feeling experienced by people.
The candidates were confused by the ambiguous instructions.
No error. Confused describes how the candidates felt.
The children were fascinated by the scientific demonstration.
No error. Fascinated describes the reaction experienced by the children.
The long lecture made the students feel bored.
No error. Bored describes the students' emotional state, while made + object + bare infinitive is also correct.
The authorities allowed the visitors to enter the museum after verification.
No error. Unlike let, allow takes object + to-infinitive.
The students were made to rewrite their answers.
No error. In the passive of causative make, to is restored: were made to rewrite.
We got the damaged window replaced yesterday.
No error. Get + object + past participle correctly expresses arranging for a service to be performed.
The supervisor got the workers to complete the task before noon.
No error. The active causative with get is get + person + to-infinitive.
We had the air conditioner repaired before summer.
No error. Have + object + past participle means arranging for someone else to perform a service.
I had the technician repair the computer before the examination.
No error. The active causative structure is have + person + base verb: had the technician repair.
Having carefully considered both proposals, the board selected the second one.
No error. The board logically performed both actions.
Based on the available evidence, the committee reached a unanimous conclusion.
No error in normal standard usage. Based on the available evidence appropriately indicates the evidential basis for the committee's conclusion.
Compared with the previous model, the new device consumes less power.
No error. The comparison correctly applies to the new device.
To complete the project on time, additional workers were hired.
No error. The additional workers can logically be understood as the people hired to complete the project on time.
To improve her vocabulary, Meera reads an editorial every morning.
No error. The infinitive phrase correctly expresses Meera's purpose.
While waiting for the interview, the candidates reviewed their notes.
No error. The understood subject of waiting is the candidates.