Hardly ______ when the bus suddenly pulled away.
Few weight-loss pills can help to keep people slim, _______?
Dad, I ______ the theatre for a while, but I left my ticket at home.— Don’t worry, my boy, I will take it to you.
Thomas _____ in inventing many electrical machines
Zhong Nanshan, the famous medical scientist, has devoted most of his life useful ways in treating cough diseases.[ ]