X. Combine these following sentences using the words given in the brackets:
1.Ba often gets good grades. He always studies hard. ( Because )
……………………………………………………………………………………………………..
2. You should be careful with the food you eat. You will have an allery. (Or )
……………………………………………………………………………………………………..
3.She had to cook dinner herself. Lan’s mother was home late yesterday. (So)
……………………………………………………………………………………………………...
4.To stay healthy, we should eat more vegetables. We should reduce high-fat food. ( And )
……………………………………………………………………………………………………...
5. We talk and sing for the elderly people. It makes them happy (because)
……………………………………………………………………………………….……………