My friends say I'm trusting. Sure,I'm awhat you see is what you get" kind of person. So __16__ I expect the same kind of __17__ from others. But I don't fall for just anything. and I never would have __18__ there we1re aliens（外星人）around, at least __19__ I saw one with my very own eyes.My friend Danny Stone and l were staying in his uncle's cottage for the weekend. Danny kept telling me stories about aliens frequently visiting the district, even though I said l was __20__. At round 3 o'clock in the morning,1 was suddenly woken up by a shocking sound. What I saw next almost made my heart __21__. Outside, sitting in the branches of a tree, was something that looked like an alien. Danny took a blanket and __22__ to have a closer look. I __23__ at a distance—not that I was afraid;1 was smart,I'd watched enough TV to know that aliens couldn't be trusted! When Danny was __24__ enough, the alien seemed to __25__him, and they both fell to the ground. Danny __26__ to throw the blanket on top of it.Sensing control over the situation,I ran into the cottage and cried, "Mr. Stone! We __27__ an alien!"Later,I would remember that __28__with extreme embarrassment. Danny was __29__ like mad and threw the alien at me. Even thoughI could see now that alien was __30__ packing foam, I couldn't believe I had been __31__ in such a way. The alien had been __32__ in the tree by Danny. He was a better __33__ than I had ever thought he was. and my __34__ was far more active than I had ever realized. It all added up to one thing:I was easy to __35__.Too trusting. Too believing（）

A.luckily B.probably C.naturally D.gradually