Answer : The homogeneous solutions are, sugar water, air, an unopened soft drink and cement.
Explanation :
Heterogeneous mixtures : It is a mixture that appears non-uniformly throughout the solution and the particle size or shapes are also different.
Homogeneous mixtures : It is a mixture that appears uniformly throughout the solution and the particle size or shapes are not different.
As per question,
Sugar water : It is a homogeneous mixture because its composition is the same throughout the solution.
Air : It is a homogeneous mixture of the gaseous substances of nitrogen, oxygen, and smaller amounts of other substances.
Peanuts and water : It is a heterogeneous mixture because its composition is different throughout the solution.
An unopened soft drink : It is a homogeneous mixture because its composition is the same throughout the solution.
Cement : It is a homogeneous mixture because it is a mixture of calcium compound.
Hence, the homogeneous solutions are, sugar water, air, an unopened soft drink and cement.