Duolingo English Test practice questions in the real exam format and timing.
Many scientists now believe that regular physical exercise can significantly reduce the long-term risk of developing serious heart disease.
The experiment clearly showed that indoor plants tend to grow faster when they are exposed to soft classical music every single day.
A team of researchers recently discovered a previously unknown species of frog deep in the mountains of central Vietnam last year.
Water naturally expands when it freezes, and that is exactly the main reason why exposed pipes can burst during very cold winters.
The large-scale study concluded that sleeping fewer than six hours a night negatively affects both memory retention and overall concentration.
Từ khoa học thường dài và khó đọc: hypothesis, conclusion. Luyện phát âm trước.
Record 90 seconds. You get four criteria, the exact words that slipped, and your own sentence rewritten two levels up.