All the students ______come from America are here.
Many new buildings are being ________ in this area now.
You shouldn’t accept a gift from a person _____ you don’t know him.
I first met Lisa three years ago. She _______at a clothes shop at the time.
-- I hear Jane has gone to the Holy Island for her holiday ? --- Oh, how nice ! Do you know when she __________ ?
—I’m sorry for being so late. I should have called you earlier.--_________. I’ve just arrived.