Nathan ........................ (read) comics.

Solution:

• The sentence doesn't provide a specific time indicator like 'now' or 'usually'. However, in the context of grammar exercises where a choice between tenses is offered, and without further context, it's often implied to be a general statement or habit if a specific ongoing action isn't indicated. If it were meant to be ongoing, it might be phrased 'Nathan is reading comics right now.' Given the simpler structure, Present Simple is a plausible choice for a general statement. However, if this follows a context of immediate actions, Present Continuous is also possible. Assuming a general statement of hobby or current activity without explicit time markers, Present Simple is often the default for describing what someone does. Let's consider the most common usage in such exercises. If Nathan is reading comics *at this moment*, then 'is reading' is correct. If it's something he does regularly, 'reads' is correct. Without more context, 'is reading' is a strong candidate for an action in progress. Let's assume it implies a current activity.

Answer: Nathan is reading comics.