Question: After variable cloudy but mostly dry weather in the morning we can expect mainly cloudless weather
Please fix the punctuation.
Fixed: [After variable cloudy, but mostly dry weather in the morning we can expect mainly cloudless weather.]

Question: Some children may want to learn to skate or ski but some children are waiting
Please fix the punctuation.
Fixed: [Some children may want to learn to skate or ski, but some children are waiting.]

Question: He went to live in the mountains and only maintained a post office box as a link with the outside world
Please fix the punctuation.
Fixed: [He went to live in the mountains and only maintained a post office box as a link with the outside world.]

Question: Stretch pictures images diagrams illustrations photographs
Please fix the punctuation.
Fixed:
[Stretch - pictures : images diagrams, illustrations, photographs..]