He is a ___________ student, and he always listens to the teachers ___________.

The book was written in 1946, __________ the education system has witnessed great charges.

We ________ the job ________ five parts, and each man did one part.[ ]

It’s a pity that Andrew didn’t want to go to the conference.________ willing to go，we could have paid all his expenses.

Where did you learn Greek? —–I didn’t. I just sort of _____ when I lived there.