We must behave ____ at a formal table.

—How______do you attend the evening classes?—______,three times per week.

A firm from New Zealand has revealed a set of robotic legs which they claim will soon allow ________ wheelchair-bound people to walk again.

It is most _____that the environmentalists will come to the area to investigate the possible damage caused by the serious pollution.

My house is located near the main street, so my family were____ upset by the outside noise.