Kevlar is ___ than concrete.

• strong

• stronger

• more strong

• strongest

This material is ___ than the previous one.

• hard

• harder

• more hard

• hardest

The new design is ___ than the old one.

• efficient

• more efficient

• most efficient

• efficiency

Steel is ___ than wood.

• durable

• more durable

• most durable

• durability

This slab is ___ than the last one.

• thick

• thicker

• more thick

• thickest

The new bricks are ___ than the old ones.

• heavy

• heavier

• more heavy

• heaviest

This membrane is ___ than the previous layer.

• thin

• thinner

• more thin

• thinnest

The new material is ___ to install than the old one.

• easy

• easier

• more easy

• easiest

The asphalt is ___ than the paving bricks.

• sticky

• stickier

• more sticky

• stickiest

The new structure is ___ than the old one.

• strong

• stronger

• more strong

• strongest