

Mercury is the closest planet to the sun.
[ˈmɜrkjəri ˈɪz ðə ˈkloʊsəst ˈplænət tə ðə ˈsən.]
It's extremely hot during the day on Mercury.
[ˈɪts ɪkˈstrimli ˈhɑt ˈdʊrɪŋ ðə ˈdeɪ ˈɔn ˈmɜrkjəri.]
Is Mercury bigger than our moon?
[ˈɪz ˈmɜrkjəri ˈbɪɡər ˈðæn ɑr ˈmun?]
"Mercury" is in the lesson "Space" (Level 25), along with 15 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.