Điền vào chỗ trống

chỉ hết cho mình với ạ 
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15.
gas
is found underground. People usually use it for cooking.
16. Children are so
They can play all day without feeling tired.
17. President Donald Trump is the most
man in the U.S.
18. My mom is
worried because my grandmother is seriously ill in the hospital.
19. People use light and heat from the sun to make solar
20. His father died of heart