Sure! Here are the verbs filled in with the correct tense:

Last year, I (1.go) **went** mountain climbing for the first time. It was exciting and terrifying at the same time. We (2.move) **moved** slowly and carefully, and it (3.take) **took** three days to get to the top. When we climbed onto the summit, we (4.find) **found** another group of climbers. They (5.arrive) **had arrived** several hours ahead of us. They (6.have) **were having** dinner and listening to Beethoven. We (7.laugh) **laughed** and they (8.invite) **invited** us to join them. The climb (9.be) **was**, to say the least, an unforgettable experience.