He is _______ in class and has _________ for two hour.—He is so tired these days preparing for the mid-term exam.

下列各组词语中没有错别字的一项是（ ）

ajor will you choose when you are atuniversity—____ but English, which has brought terrible dreamsto me for the past 12 years.

“Show me your ticket, ________ I won’t let you in.”the guard(保安) said angrily.

If you ______ the chat room ten minutes ago, you _______ what we were talking about