Studies show that people are more __________ to suffer from back problems if they always sit before computer screens for long hours.
—Tom came to work last Friday ,but no one has seen him since. —he have had an accident ?
—I telephoned him twice and I couldn’t get through to his home. —I think the line might have been out of order, ________?
—It cost me 30 yuan to get here. —Well, it was crazy of you to take a taxi _______ you could come by bus as well.
—Will you go shopping now? —Not until I ________ my experiment.
Every child is _____ to it parents.