All of us know, color-blind people often find it difficult to __ between blue and green.
A、separateB
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Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.
Ihopemyfather____askmeaboutmymarks.
ProjectHopeisanorganization_____raisesmoneytobuildschoolsandbuybooksforpoorchildren.
Hearrived____London____acoldwinternight.
Oneoftherequirementsforafireisthatthematerial____toitsburningtemperature.
