He found that complex problems, especially those _____ abstract thinking, were best for picking out bright and dull students.
We only had $ 100 and that was __________ to buy a new computer.
As far as I am concerned, education is about learning and the more you learn,__________.
He preferred __________ rather than __________.
The visiting professor giving lectures to students __________ invited to meetings at times.
They quarreled lastnight, but soon __________,talkingand laughing happily.