Old people must .
Jim is ______excellent runner. He often comes _____first in the race.
--- My mother says that we won't go on a trip to Hong Kong. I just can't understand. --- _______. You were looking forward to it.
--- ________ does she weigh now? --- Her ________ is 50kg.
He made a fire _______ himself _______ warm.
--- What were you and your cousin doing at this time yesterday? --- He was reading a magazine ________ I was writing an e-mail.