Duolingo English Test practice questions in the real exam format and timing.
Discarded plastic bags can take several hundred years to fully break down, causing serious and lasting damage to the surrounding natural environment.
Renewable energy sources such as wind power and solar panels are now actually cheaper than burning coal in a growing number of countries worldwide.
The city council plans to completely ban all single-use plastic products in local restaurants and shops by the very end of next year.
Dangerous air pollution caused by heavy traffic and old factories remains the single biggest health risk facing people in many crowded urban areas today.
Community recycling programmes tend to work best when all local residents clearly understand exactly which types of everyday materials can actually be recycled.
Sustainable: /suh-STAY-nuh-buhl/. Emission: /ih-MISH-uhn/. Âm cuối phải rõ.
Record 90 seconds. You get four criteria, the exact words that slipped, and your own sentence rewritten two levels up.