When I approached to the subway entrance, an explosion occurred. This ___my first experience, I got into panic

---What’s wrong with your cell phone? I can’t get through.--- Oh, my line was cut off because I ________ my bill.

The student told me that he _______ the exam _______.

 --- What would you do if it ______tomorrow? --- We have to carry it on, since we’ve got everything ready.

Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.