Robert likes to take a walk in the park after work. One day when he was walking in the park, he heard a woman calling his name. He stopped to look around, but he didn’t see anything 　16　. Shortly after Robert saw it, it was gone. Though Robert felt a little strange, he did not think about it too much and sat down for a rest on a bench in thepark. Then he noticed the snake he just saw 　17　. Robert was so scared that he couldn’t move away from the bench. Right at this moment, a woman behind him shouted, “Come here, Robert. You can’t stay on the bench like that.　18　.”In surprise, Robert turned around and said to the woman, “Excuse me, but that’s not a very nice thing to say, and in fact many people say I’m cute and handsome.”　　 “I’m not talking to you,” said the woman. “I’m telling Robert, my pet snake, to get down from the bench, not you.”
16.
(A) like a snake
(B) that could move
(C) except a little snake
(D) that could make noise