For Q1 and Q2:
http://www.thesaurus.com/browse/delicious
Your passage is fine. You might say "his" or "her" pet instead of "the" pet.
1. What are the synonyms of delicious?
-They are yummy and tastey.
2. What is the antonym of delicious?
- It is tasteless.
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Q1: Are the questions and answers correct?
Q2: Do you have other common opposites of 'delicious' other than 'tasteless'?
3. Chuchu behaved strangely. He hit against the flowerpot many times. What did the master do for the pet? He took the pet to an animal hospital.
(Would you check the short passage? Thank you.)
2 answers
Rather than "hit against..." I'd say, "He ran into the flowerpot many times."