When the ferry is at sea you cannot go out on deck. 
She felt at sea on the first day of school. (= confused, perplexed)

The end of the world is at hand. (= near, close in time)

We need at least $20,000 dollars for the furniture.

Phone me at work later.

When Britain and Germany were at war, Sweden remained neutral. 

After several attempts we at last got the operating system installed correctly.

Most of the countries of Western Europe have been at peace since 1945.

The horses  went crazy ar sight or smell of a bear. 

I don't feel at ease with this kind of music.

He likes living in the city, but at heart he's still a country boy.

He described his accident at length to everyone.

Don't leave it, do it at once.

I didn't like it here at first, but now I've grown to appreciate it.

There must be an adult on duty when the children are at play.

His explanation did not put our minds at rest, and we weren't satisfied.

I'm living in Discovery Bay at present, but not for much longer.

In brief, the prosecution's case is based on the fact that he lied.

Take an umbrella in case it rains.

He's my brother, but we don't have many interests in common. 

We are in danger of losing the contract.

Most of the farmers are in debt to the banks. 

Helicopters were scrambled after reports from a North Sea oil rig that it was in difficulties.

They will have an answer for you in due course, but you have to be patient. 

I thought he was about 50, but in fact he's only 45.

If you divide the room in half, you would still be able to get all the desks in.

The British are eating less food in general and less junk food in particular.

She is secretly in love with another man.

Gone are the days when this tournament was international in name only.

The government thinks this is an opportunity to reassess how those most in need can be helped.

They need a higher grade in order to be accepted on the course.

The British are eating less food in general and less junk food in particular.

He knocked over the vase and it broke in pices on the floor.

I have something to tell you in private.

Kissing in public is not usually done, although holding hands is common.

In reply to your question, the answer is yes.

They believe the government is carrying out research in secret. 

When the island of Tioman came in sight the view was fantastic.

We don't have this model in stock, but we can order it for you.

Let us consider each of those points in turn.

You won't understand it now, but in time you will.

The exhibition attracted a lot of people off the streets, many in tears and unable to speak.

Good accommodation was in short supply.

The typhoon has changed direction so it looks as if Hong Kong is out of danger.

You need to check the milk to see that it's not out of date.

In summer the children can play out of doors and have more things to do.

I could see they were talking about me but they were out of hearing so I don't know what they were saying.

I'm afraid the lift is out of order so you'll have to use the steps.

They stood watching the plane until it was out of sight.

I feel out of place there, everyone seems to be dressed so formally.

The price of a house in Central London is far out of reach of most ordinary workers.

We are out of stock of this model just now.

Government ministers who speak out of turn are likely to be reprimanded. 

More than 7% of the work force is out of work now.

The championship is now within reach for Liverpool if they can beat Manchester United.

I live within sight of the Kowloon coast and Hong Kong island.