Some scientists believe that         is no doubt         a cure for AIDS will be found.
#93048
A
it; that
B
it; whether
C
there; that
D
there; whether
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The drunk driver is ___ for the traffic jam  yesterday.
#94669
A
to blame; occurred
B
to blame; occurring
C
to be blamed; occurred
D
to be blamed; occurring
 It never _____  humans until the mid­1990s that some animals can be cloned.
#92718
A
occur
B
is occurred
C
occurred to
D
occurred
I’m not a little tired today after giving the room a thorough cleaning and I have never had_________today.
#93480
A
as tiring a day as
B
as a tiring day
C
tiring as a day as
D
day as tiring as
      our earth, or else it will be no longer fit for us to live on.
#92853
A
Protect
B
To protect
C
Protecting
D
Protected