Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______ of the quality of their products.
They think the room is________, but as a matter of fact it is already occupied.
It is common knowledge that washing wool in hot water will make it________.
—Can you help me with this question, Tom? —Sorry, it is beyond my________.
Air is________and of no smell but we can feel its motion when there is a wind.
Mountain climbing must be very tiring, ________,you might feel sick with the air getting thinner.