10, As I expected, he did not believe me. 'Try it!' I said encouragingly.

as----关系代词， 引导非限制性定语从句。他所指代的内容就是主句的整个句子的含义。
e.g.As we know, the earth is round. (众所周知)

e.g. As Brian pointed out, ...（正如...所指出的）
e.g. As I mentioned,...(正如我提到的)

关系代词as 和which的区别：
as 所引导 的非限制性定语从句，可用在主句之前
which 引导的非限制性定语从句，只能用在主句之后

副词形式：encouragingly

11, He was greeted by an unpleasant smell which convinced him that I was telling the truth.
greet:问候，向...致意；觉察到, 呈现在...眼前，在...耳边新概念英语复读机

e.g.I woke up and was greeted by a bird's song.

e.g. Inside the room a dreadful mess greeted us.

e.g. When he went into the kitchen, a smell greeted him.