81. Male and female students are quite different from each other ______ the age at which they begin to develop an intellectual self-discipline.
---- Did you pass the driving test? ---- No. I ______ it, but I had little time practicing.
Alone in the lab on Sundays, the young scientist was so busy with his research work that he felt _____ but lonely.
Though every parent admits that reading contributes to better mind of their child, yet let’s face it, who has got time?
----I am going to come to meet you tomorrow. Shall I bring something to read? ----OK, ______________.
Mr. Green didn’t understand ________made his daughter so absent-minded.A. how that was B what was it C. why it was that D. what it was that