Sentence: Giving knives or things that cut ... a wedding present is considered

[Nameless]

Which answer is correct?
Giving knives or things that cut ___ a wedding present is considered bad luck.
a) as
b) before
c) in
d) after
:) :)

[Nameless]

which one's correct?
___ nearly half of the continent of South America, Brazil is the largest of the Latin American countries.
a.Covering
b.Covered
c.Cover
d.To cover
I think all 4 answers correct, is it right? Please help!