Fill in the blank We were at school together, but our ____________ after we left school.

Explanation:

The sentence needs a correct collocation (natural word combination) in past tense.

👉 “Our friendship developed after we left school” is correct because:

• Friendship + developed is a natural and commonly used collocation.
• It properly shows a relationship that grew over time.

Why other options are wrong:

• ❌ friends grown → grammatically incorrect structure
• ❌ friendship grows → wrong tense (sentence is in past time: were, left)
• ❌ friends developed → incorrect meaning; “friends” do not “develop”

Extra Facts (Important for Exams):

📌 Common collocations with “friendship”:

• Develop a friendship
• Form a friendship
• Maintain a friendship
• Strong friendship

📌 Collocation Trick:

👉 Think: friendship = something that grows or develops over time, not a person

Final Tip:

Always match:
✔ Meaning + Grammar + Tense = correct collocation