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Liz is going to her cousin's birthday party[at|in|on|] 17th May. The party is[at|in|on|]Saturday. It starts[at|in|on|]5 o'clock[at|in|on|]the evening.

So,[at|in|on|]tomorrow Liz and her mother are going to buy Liz's cousin, Jane, a cool present. It will be a hot day, so Jane is planning to have a pool party. Liz is very excited about that.