The lecture, ______ at 7:00 pm last night, was followed by an observation of the moon with telescopes.
He has three brothers, ________is a doctor.
As teenagers of the 21st century, we should be ready to _____ the challenge of society.
The reason _____ they held a party was _____ it was Sue’s birthday.
--Why do you look pale today? --I was very ________my mother’s illness. I stayed awake last night.
I _____ in the street when someone _____ me.