Directions: Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘no substitution’.
The market was crowded with shoppers and I was feel very uncomfortable.

The sentence describes a past event ('The market was crowded...'). To maintain parallel structure and past tense consistency, the continuous action of feeling uncomfortable in the past should be expressed using the past continuous tense form: 'was feeling'. 'was feel' is grammatically incorrect.