I ___, but I didn't think you were serious.
---Have you found your book yet? ---No. I’m not sure where I ___it.
---Why did you come late this morning? ---We were___for an hour in the traffic jam.
---Why are you so late? ---I got stuck in the traffic jam, or I ___earlier.
Mount Wuyi is such an attractive place of interest ___everyone likes to visit.
--How’s that? Who broke the glass? ---Well, it ___me. I was doing my homework the whole evening.