I hardly recognize you. I (not to see) you since you (to book) them several days ago. 25. I can (to leave) for Moscow. And you (to change) so much.

Solution:

We need to fill in the gaps with the correct verb forms, mostly focusing on the Present Perfect tense as indicated by phrases like 'since you...' and the context of past events with present relevance.

1. I hardly recognize you. I haven't seen you since you booked them several days ago.
2. 25. I can (to leave) for Moscow. And you (to change) so much. (This sentence seems incomplete or requires context for the verbs in parentheses. Assuming it's asking for a continuation or a different tense based on context not provided.)

Answer: haven't seen; booked. (The second part of sentence 25 is unclear without further context for 'to leave' and 'to change'.)