Okay, let's fill in the blanks in the text.
* **A:** The correct answer is **1) first**. The sentence should read: "It was an ordinary afternoon in the school cafeteria when I first met my closest friend now."
* **B:** The correct answer is **2) sat**. The sentence should read: "As I sat alone at a table, scrolling through my phone..."
* **C:** The correct answer is **1) as**. The sentence should read: "Her laugh was as infectious that, before..."
* **D:** The correct answer is **4) the closest**. The sentence should read: "When she caught my eye, she asked me to join their table. We got closer, thanks to shared jokes..."
* **E:** The correct answer is **3) meeting**. The sentence should read: "...and by the end of lunch, we were already exchanging numbers and planning meeting up for a concert."
**Explanation:**
* **A:** 'First' fits here as it denotes the first time meeting a friend.
* **B:** 'Sat' is correct past tense form of 'to sit' in the given context.
* **C:** 'As' is needed to form a comparison with how infectious the laugh was.
* **D:** 'Closest' implies that a degree of personal closeness/nearness is developing.
* **E:** 'Meeting' is a gerund form of the verb which fits grammatically correct in the context where it indicates planning the next meet up