Fill in the blanks with before, after, during, while. 1. Wе worked hard __ the examination. 2. __ classes I usually go back home. 3. Let's go tо а cafe __ the concert. 4. She took а lot of pictures __ her trip to Britain. 5. She went to sleep__ reading the book and didn't turn off the light. 6. I’ll call her __ I receive her letter. 7. Let's have а snack ____the break. 8. Don’t enter the classroom _____ a lecture. 9. Look ___ you jump. 10. He publishes one book ___ another. 11. She always had a scholarship ____ his university days. 12. He ran so quickly that he arrived ___ me.