All of us know, color-blind people often find it difficult to __ between blue and green.
B
暂无解析
Nowherebutintheremotestregionofthecountry____findaplacetosettledown.
Thefirststepinthestudyofanylanguageisobservingand____preciselywhathappenswhennativespeakersspeakit.
Iam____gratefulforthemanykindnessesyouhaveshownmyson.