It was not until the beginning of the twentieth century________to explore space.
#93086
A
did man begin
B
when man began
C
that man began
D
then man began
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What a table! I have never seen such a thing before. It is ______ it is long.
#91960
A
half not as wide as
B
wide not as half as
C
not half as wide as
D
as wide as not half
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
— Should people stop using their cars and start using public transport?— __________. The roads are too crowded as it is.
#94779
A
All right
B
Exactly
C
Go ahead
D
Really