Based on the question given this is the answer:
He thinks she is worried but optimistic about her husband's
health.
In the central theme of the story, it is given a fact that
the belief of superstitions is something to be afraid of, although people have
taken a wise decision to trust on medicinal treatments.
The adverb clause here is 'than we had predicted', and it refers to 'colder' which is the correct answer here.
Answer: The purpose of vaccination is to produce immunity. Immunity means the presence in a person's body of cells and substances known as antibodies that can produce a protective immune response.
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