I felt puzzled when the man ..... to me in Chinese.

Solution:

• The sentence requires the past tense verb form because the action of feeling puzzled happened in the past.
• Looking at the options:
  • 'spoke' is the past tense of 'speak'.
  • 'speeks' is incorrect; the present tense for 'he/she/it' is 'speaks'.
  • 'speek' is incorrect; it's not a valid English word.
  • 'speeking' is the present participle, used for continuous tenses or as a gerund, which doesn't fit here.
• Therefore, 'spoke' is the correct past tense form to complete the sentence.

Answer: spoke