1 . I attended a very important lecture yesterday.
→ —Could you meet me at the airport at nine o’clock?
—I’d like to, but I’m afraid I _____________ a very important lecture then. (用正确的时态改写句子)

2 . Complete the conversations with the correct expressions in the brackets.
Sam:     1     (Will you be visiting/Have you visited) the science exhibition next month?
Amy: Yes. You know I’m a technology enthusiast and I     2     (am looking forward to/will be looking forward to) it.