Last night, before the exam, I went over the lessons_______I couldn’t keep my eyes open to stay awake any longer.
#79740
A
before
B
until
C
unless
D
when
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—Henry, the phone is ringing. Do you want me to go? —No ,sit still.    .
#80537
A
I’ll get it
B
I am to get it
C
I’m getting it
D
I am about to get it
No one knows exactly ______ this important discovery was made.
#33284
A
that   
B
that how   
C
what   
D
when