Answer: cork and wax
Step-by-step explanation: Density is defined as the mass of substance contained per unit volume.
A substance which has higher density than water will sink in water and the one which has lower density than water will float in water.
Given: density of water =

As we know: density of aluminium =

density of cork =

density of iron=

density of lead=

density of wax =

Thus as density of cork and wax is lower as compared to water, both cork and wax will float in water.