In those days bikes were not ______ used because few people could afford (负担起) to buy one.

I hate _______ in such a noisy room.

Do you like swimming—Yes, swimming is a good way _______ fit.

The terrible accident is under investigation. —Actually, quicker action ______ those workers trapped in the mine.

You are too___________him. After all he has only been in this field for no more than a year.