I listened to Dr. Johnson’s lecture about biology, but I failed to get its key ____.
#7298
A
words
B
notes
C
messages
D
points
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His latest research is at the   of genetic science. 
#5898
A
maiden voyage
B
cutting edge
C
focus group
D
daily basis
I wrote him a letter to show my _____ of his thoughtfulness.
#7294
A
achievement
B
agreement
C
attention
D
appreciation
___ is an engineer.
#7345
A
Li Pin’s and Li Hua’s father
B
Li Pin and Li Hua’s father
C
Li Pin’s and Li Hua father
D
Li pin and Li Hua father