When he was working there he caught a serious illness from _____ efforts he still suffers. 
#72572
A
which
B
that
C
whose
D
what
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We’ll go to the park ____________tomorrow.
#41246
A
if it isn’t rain
B
if it won’t rain
C
if it doesn’t rain
D
if it doesn’t rains
In an experiment, pet owners are being encouraged to take their pets to work, a move _______ can be good for both the people and the pets. 
#74659
A
that some scientists say
B
in which some scientists say
C
some scientists say that
D
some scientists say