—Why didn’t you finish the task?—I didn’t think it is ________ the effort.
Tom ought not to ________ me your secret, but he meant no harm.
— You haven’t lost the ticket, have you? — _________. I know it’s not easy to get another one at the moment.
Eating too much fat can _______ heart disease and cause high blood pressure.
--- Tom, why didn’t you come to the meeting yesterday? --- I _____, but my car broke down.
There is no doubt ______ man will conquer nature some day.