1. People _____ that the earth was round before. A. not used to believe B. used to believe B. will not be used to believe 2. Astronauts ______ in their spaceship, but they often work outside. A. used to stay. B. was staying B. used to stay D. used to stay 3. These city girls get used to ______ in the field. A. used to lie B. to working C. would like D. to work 4. Formerly ___ infant of whooping cough. A. will die B. used to die C. died D. both B and C 5. Newton_____ science books when a boy. A. had read B. read C. had read D. had read (giúp mình với ạ)

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