Choose the best synonym for the word 'unique'.

Choose the best synonym for the word 'try'.

Choose the best synonym for the word 'assist'.

Choose the best synonym for the word 'advocate'.

Choose the best synonym for the word 'boast'.

Choose the best antonym for the word 'vicious'.

Choose the best antonym for the word 'mourn'.

Choose the best antonym for the word 'attach'.

Choose the best antonym for the word 'export'.

Choose the best antonym for the word 'open'.

Choose the best antonym for the word 'refuse'.