How long have you been going to work on foot?—Since last month when I ________ from a heart attack

ys, many people walk to work CopenhagenConference calling for living a low-carbon lifestyle to cope with globalwarming.

We really shouldn’t use plastic bags any more when shopping.—_____ It’s important to protect our environment.

10．The housewe used to livehas been rebuilt．

“Was his father very strict with him when he was at school?” “Yes. He had never praised him _______ he became one of the top students in his grade.”