适合

suit; fit; fit in; do; match; become; befit; agree with; be suitable for; be appropriate for; be fitting for; be right for; be proper for; be compatible with; be tailored to; suitable; meet; appropriate; fitting; proper; fitness; suitability; harmony; compatibility; appositeness; suitably; appropriately; fittingly; to; around; on point; in tune

年级

grade; year; form

孩子

child; kid; children; youngster; son; daughter; family; offspring; son or daughter; bairn; sonny; progeny; childish; childlike

唱歌

sing; chant; carol; vocalize; sing a song; vocal; singing; song; vocalization