问题描述：
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
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
问题解答：
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