Answer:
Add the transition “However” between the sentences.
Step-by-step explanation:
'However', is a conjunction used to join two independent clauses. It is used to indicate that there are opposing ideas or contrasts which the writer wishes to highlight. The sentence above written by the student, presents a contrast of ideas.
While the first sentence indicates what Greg wants, the second sentence shows what his father prefers. These two contrasting ideas can be joined with the word, 'however'.