

We always travel first class on long trips.
[wi ˈɔlˌweɪz ˈtrævəl ˈfɜrst ˈklæs ˈɔn ˈlɔŋ ˈtrɪps.]
These tomatoes are second class, so they're cheaper.
[ˈðiz təˈmeɪtoʊz ər ˈsɛkənd ˈklæs, ˈsoʊ ˈðɛr ˈtʃipər.]
Hotels are divided into different classes by stars.
[hoʊˈtɛlz ər dəˈvaɪdəd ˈɪntə ˈdɪfrənt ˈklæsəz ˈbaɪ ˈstɑrz.]
"class" is in the lesson "Specifications" (Level 44), along with 11 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.