Complete the blanks with the passive form of the verbs in parentheses. (Hoàn thành chỗ trống với dạng bị động của động từ trong ngoặc)

We had an amazing trip to Europe last summer. The dates (1)____ (choose) two months before we started. Our flight (2) ____(book) at that time as well, but our hotel (3) ____ (not arrange) until the day before our departure. However, we enjoyed the trip a lot. We took many photos and we (4) ____(treat) very well by the tour organizers. Our only regret was that we bought some souvenirs, but they (5) _____(lose) on our way home.