Choose the best answer to complete these following sentences

D. Writing
Choose the best answer to complete these following sentences.
Question 1: Astronauts
A. were used to stay
Question 2: People
in their spaceship, but they frequently work outside now.
B. used to stay
C. were staying D. had used to stay
that the earth is round before.
A. were not used to believe B. used to believing C. would not use to believe D. did not use to believe
Question 3: Tuberculosis
A. use to be thought
Question 4: Formerly babies
A. have died
incurable before.
B. used to be thought
C. used to think D. use to think
of whooping cough.
B. used to die
Question 5: These city girls are used
A. to work
C. would die D. both B and C
in the field.
B. used to lie C. would like D. to working