I don’t often lose things and I’m especially careful with mo

I don’t often lose things and I’m especially careful with money,so I was quite surprised when I reached for my wallet and it wasn’t there.At first,thought it was possible that I could have left it home.Then I remembered taking it out to pay for the taxi,so I knew I had it with me just before I walked into the restaurant.I wondered if it was possible that it could have slipped out of my pocket while I was eating dinner.Thinking about that possibility,I turned and walked back to the table where I had been sitting.Unfortunately,there were several people C at the table at the time,so I called a waiter and explained to him that my wallet had fallen out of my pocket while I was sitting at the table a few minutes earlier.I had the waiter go over the table to see if my wallet was on the floor.While the waiter was looking for it,the manager of the restaurant came up to me and asked me if anything was wrong.I didn’t want to get a lot of people involved in the problem,but I knew I 16 to get a lot of people involved in the problem,but I knew 17 had happened.He had me describe the wallet to him,and then he insisted that I report the having missed wallet to the Police.I told him that I didn’t particularly want to get the police involved in it; besides I was in a hurry because I had an appointment with my doctor in just a few minutes.
16.A.must B.had C.may D.ought
17.A.what B.that C.how D.why