Open the bracket and put the verb into the correct form. We ....... (eat) dinner at the moment.

The sentence is in the present continuous tense because of the phrase "at the moment". The present continuous is formed with the present tense of 'to be' + the -ing form of the main verb. For 'we', the form of 'to be' is 'are'. The -ing form of 'eat' is 'eating'. Therefore, the correct answer is are eating.