Our teacher is always busy preparing lessons until 11 o’clock at night, _______we students have gone to sleep.
#72072
A
that time
B
by which time
C
by that time
D
which time
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Some scientists have questioned the theory ______ CO2 is causing dangerous global warming.
#68429
A
which
B
what
C
that
D
why
These wild flowers are so special that I would do ____I can to save them.
#74661
A
whatever
B
that
C
which
D
whichever
I am afraid I am not fit for the job, because it is one requires a lot of patience.
#74136
A
who
B
that
C
what
D
where