_______has recently been done to provide more buses for the people ,a shortage of public vehicles remains a serious problem .  
#73038
A
That
B
What
C
In spite of what
D
Though what
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I have bought 2 ballpens, _______ writes well.
#70187
A
both of which
B
none of which
C
neither of which
D
neither of them
____________, I still couldn’t figure out what the headmaster said at the conference.
#68032
A
Though I didn’t listen attentively
B
Attentively as I listened
C
Attentively as did I listen
D
As long as I listened
19. Is this the very factory ____ he visited last month?
#73107
A
which
B
that
C
where
D
in which