He observed a stranger _______ around the store at 12 p.m. last night.
_____ basic first-aid techniques will help you respond quickly to emergencies.
I’m calling about the apartment you ______ the other day. Could you tell me more about it?
It was playing computer games _____ cost the boy plenty of time _______ he ought to have spent doing his lessons.
David is ______ animal fur, so he won’t visit anyone who has cats or dogs in the house.
John invited about 40 people to his wedding, most of ______ are family members.