请你根据图画的提示，补全对话。
1.A: Wheredoestheraincomefrom?
B:
2.A: Wheredoesthecloudcomefrom?
B:
3.A: Wheredoesthevapourcomefrom?
B:
4.A: Howcanthewaterbecomevapour?
B: Thesunshinesand

1. Itcomesfromtheclouds.
2. Itcomesfromthevapour.
3. Itcomesfromthewaterintheriver.
4.thewaterbecomesvapour.