The silence in the dark building was scaringNo sound and voice____ heard at that moment

How long have you learned English—So far, we ________ English for more than six years.

traditional Chinese medical records, Youyou Tu rediscovered an ancient plant-based treatment for malaria that worked ________ modern therapies failed.

It was three o’clock in the afternoon _____ a villager telephoned to tell me the surprising discovery of an ancient tomb.

How can I get a present in the game show—You _________ one if you answer all the questions correctly.