Combine the sentences to complete the sentences, using the words in brackets

VII. Combine the sentences to complete the sentences, using the words in brackets.
1.     My grandfather is very old. He is still young at heart. (although)
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2. During Tet, Vietnamese people buy all kinds of sweets. They make Chung cakes as well.(So)
        
3. At the Mid-Autumn Festival, kids can sing, dance, and enjoy moon-cakes. Every child like it very much.(Therefore)
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4.  Tom gets a lot of money. He works hard. (because)
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