Underline and correct the mistakes in the following sentences

VII. Underline and correct the mistakes in the following sentences.
1. Are aliens going to visit our Earth in fifty years' time?
2. Be careful, Rosie! You are spilling all the milk over my favourite sofa.
3. Elise will be certainly back to school tomorrow when her leg is treated.
4. They stroll around the Christmas market tonight. All has been planned.
5. Everybody thinks that emails will be completely replacing letters in the future.
6. Shall you teach Alex more lessons about Vietnamese customs and traditions?
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7. This year it's snowing less than expected. They won't hold the snow sculpture
competition.
8. If people keep drinking untreated water, they are getting cholera and other diseases.
9. Do you believe that people will be living in smart houses and drive flying cars?
10. At this time next month, we are hiking in Mount Fuji and it will be an amazing experience.