Antonym of 'unsure'

The same question, asked 2 times: 21 Jul 2023 S1*, 25 Sep 2024 S3. Every wording below, oldest first.

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Question 1
21 Jul 2023 S1
85 $Select the most appropriate ANTONYM of the word ‘Unsure’ from the given sentence. Himanshi is preparing customised gifts and handicrafts for surprising Mehul on his retirement, but the date is not certain yet.$
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Question 2
25 Sep 2024 S3
83 $Read the sentence carefully and select the ANTONYM of the underlined word from the given options. I heard his suggestion but I am quite unsure about the risks involved in it.$
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Question 1