Thomas Edison's ______ achievement in developing the first practical electric light bulb revolutionized the way the world illuminated the night.

• impressive

• impress

• impression

• impressively

Historians are still debating the ______ of that custom and its significance in ancient times.

• festivity

• origin

• investment

• practice

To make sure your compost pile works effectively, add a ______ of green materials followed by brown materials.

• mould

• layer

• peel

• waste

Uncle Ho was admired ______ his dedication to the Vietnamese independence movement and his profound love for the people.

• for

• on

• to

• of

She began growing her own vegetables, ______ provided fresh and organic produce.

• that

• whose

• which

• who

Many communities rely ______ clean energy sources to reduce their carbon emissions.

• with

• on

• at

• for

The tunnels of Cu Chi played a crucial role in Vietnam's defense. They allowed soldiers to move undetected and launch effective attacks against the ______.

• enemy

• poem

• battle

• rule

To reduce waste, you should avoid buying products with excessive ______.

• peeling

• packaging

• boxing

• covering

To minimize your carbon footprint, you should ______ the use of single-use plastics.

• ignore

• maintain

• increase

• reduce

After a party, there was a huge ______ of garbage that needed to be sorted for recycling.

• packaging

• pile

• leftover

• bar