The lecture, a lively question-and-answer session followed.
By far, there are many problems ________ to be solved.
We’ll ________ to finish the task whatever difficulty we _________.
-Are you sure you have to? It’s been so late. Make it another time?-I don’t know ________ I can do it if not now.
It was a pity that when we hurried to the lecture hall, the lecture_________, so we heard only the end and missed most part of it.
I was about to give up the project ______ it hit me_____ I could work with my roommates. That’s to say, I can turn to them for help.