根据对话内容，在空白处填上恰当的表达，并将其答案填入对话后的答题卡内。
A: Hi, Tony. Why do you look so tired?
B: You can’t   how unlucky I was this morning.
A:   
B: This morning I nearly forgot the lecture to be held in City Library. I woke up a little late. But the note on the desk reminded me of the lecture. So I had to rush to the bus stop.
A: Did you catch the bus?
B: No. I    to do so. As soon as I saw a taxi coming near, I shouted and stopped it at once.
A: So you got to the library in time, didn’t you?
B: No.  , when the taxi was two blocks away from the library, it couldn’t move on even a bit because it had knocked into a bus when turning left.
A: What did you do then?
B: Right at that moment I received a call. I was told I  go to the lecture this morning. The news made me relaxed. I was happy.
A: Did you return home directly?
B: No. I had to stay in the town instead, for the lecture was put off until this afternoon.