题目内容：

1.Lily can play [ ] guitar but she can't play [ ] chess
1 .Lily can play [ ] guitar but she can't play [ ] chess 2.-Can Tom help my brother [ ] his math -Yes,he,can
3.-Does Mark have a brothes [ ] a sister-She has a brother

优质解答

1 the ,/ （ 乐器前用the ,第二空不用填）
2 with ( help sb with sth 帮助某人做某事）

追问：

3.-Does Mark have a brothes [ ] a sister-She has a brother

追答：

or