Duolingo English Test practice questions in the real exam format and timing.
Scient___ use the scient___ method to test hypoth___ through careful observ___ and controlled exper___.
The disco___ of antibio___ in the early twent___ century revolut___ medicine and saved mill___ of lives worldwide.
Genet___ research has revealed that human DNA is approx___ ninety-nine per cent ident___ across all popul___, regardless of ethnic backgr___.
Space explor___ continues to expand our underst___ of the universe, with recent miss___ discovering evid___ of water on Mars.
Climate scient___ collect data from sat___, weather stat___, and ocean bu___ to build accurate mod___ of future temperature changes.
Khoa học: từ chuyên ngành dài. Hypothesis, experiment, observation — nhớ cách đánh vần.
Record 90 seconds. You get four criteria, the exact words that slipped, and your own sentence rewritten two levels up.