Four-fifths of the world's computers use programs (at/in/on/about) English.

Many vegetables, including tomatoes, and corn, are native ______ the New World.

The god jumped .......... the table.

They prevented me______ entering the house.

He wore a hat, which made him look _______________ a spy.

You should concentrate _________what the interviewer is saying and make a real effort to answer all the questions the interviewer asks.

Oxygen, fuel, and hear are all necessary _____ combustion.

He suffers .......... headaches.

A game is divided ____________quarters.

This area is rich _________ oil.

An accident has happened .......... that family.

Mr. Johnson said he was ......... favor of doing the work right away.

We were very doubtful .............. his ability.

We were very disappointed _____ the organization of the festival.

Teachers are responsible (at/for/to/of) their teaching.

Please put your stuff away to make room ______ the new computer.

Aren't you glad that you went to the party with us .......... all?

I came on Monday at ten o'clock .......... the morning.

We were very grateful _________ our friends for all of their assistance.

Our flat is ....... the second floor of the building.

He is retired. He lives________________ his pension.