I didn’t quite follow him because he explained the theory _____that is too abstract for me.
While________ along the road, Mr. Smith met an old friend of his.
It was with the help of the local guide________ the mountain climber was rescued.
Either you or one of your students________ to attend the meeting that is due tomorrow.
Only when he apologizes for his rudeness________ to him again.
---How about your job hunting?---No luck. Now, I’ve reached the stage________ I don’t care what I do.