中国大学MOOC: Which of the following expressions are expressions to signal the topic of a lecture ？A. Today, I’m going to talk about …B. We’ll look at …C. Now let me illustrate... D. Let me start with …

Sorry, I’m busy now. I ______ to you tomorrow. A: talk B: talked C: will talk D: have talked

I’m busy now. I ______ to you after school this afternoon. A: talk B: talked C: will talk D: have talked

Listen! Some of the girls ________ about Harry Potter. Let’s join them. A: are talking B: talk C: will talk

When asked about the position, the applicant may say that _____ A: I heard about this position from the company’s website B: I heard about this position from a stranger in the street C: I heard about the position from a recent lecture.