good manners to say “Sorry” when you knock into someone but    no need to say it again and again .
#92894
A
There are ; there is
B
It is ; there is
C
There is ; it is
D
It is ; it is
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      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
She            more friends than anyone else I have known.
#93289
A
used to have
B
was use to having
C
was used to have
D
accustomed to have
All those second-hand goods are sold at        before.
#92449
A
30% as lower price as
B
as 30% low price as
C
30% as low a price as
D
30% lower price than