10. _____ us an apology.
A. Not once the manager offered B. Not once did the manager offer
C. Did the manager not once offer D. Didn’t once the manager offer
11. Only when you grow up _____ the truth.
A. you will know B. you know
C. do you know D. will you know
12. Rarely _____ located near city lights or at lower elevations.
A. observatories are B. are
C. in the observatories D. are observatories
13. Only for a short period of time _____ run at top speed.
A. cheetahs B. do cheetahs C. can D. that a cheetah can
14. Not until 1856 _____ across the Mississippi River.
A. the first bridge B. was the first bridge built
C. the first building bridge D. the first bridge building was
15. _____ he arrived at the bus stop when the bus came.
A. No longer has B. No sooner had
C. Not until had D. Hardly had
