The problem ________ when the students refused to do their homework.

When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.

________ so many people in the United States been out of work as today.

It ________ as a shock to realize that I was not alone in the room.

Since William had been seriously ill for several months, his parents were worried about________ to return to school full-time.

The association is ________ to raising funds to help the blind.

I won't ________ those children making a noise in my house!

The TV station, in ________ to massive popular demand, decided to continue the soap opera(肥皂剧 ).

The opposition leaders ________ the government for not taking action sooner.

In some schools children who prefer to read books rather than ________ football become social outcasts (被抛弃者 ).

When workers are organized in trade unions, employers find it hard to lay them ________.

Others argue that since the earth has endured a long string of ice ages in the last two millionto three million years, any warming is ________ to be temporary.

________ the concert had begun did we realize what a splendid show it was going to be.

________, John has been to several foreign countries.

________ they've got to know each other a little better, they get along just fine.

She got a job as an assistant stage manager at the Cambridge Arts Festival Theatre, thinkingthat it might ________ to a career as a playwright ( 剧作家 ).

Human behavior is mostly a product of learning ________ the behavior of animals dependsmainly on instinct.

After so many days without rain, the ground quickly ________ the little rain that fell last night.

If you want to find a decent location for your own home, ________ Mr. Smith for advice.

Senior members of the staff competed eagerly ________ the position of sales manager in the company.

It was three British sportsmen who ________ banned drugs.

The address book ________ the email addresses of your friends or groups of colleagues.

She ________ her nervousness to the importance of the interview.

We regret to ________ that it may not be possible to deal with every request.

General Motors, one of the world's largest auto manufacturers, is expanding its ________ in this country.

________ to the papers is restricted to Defense Department personnel only.

We were told that Sue would be ideal for the job, but she ________ badly when we talked to her.

________ from the occasional late night party, our neighbors are very quiet.

I don't know how we can make ________ on the timetable for any more courses.

I'm sorry I forgot to write; I had so much else ________ my mind.

The boy ran out of the classroom without the teacher's _______.

_______ the movie I would have finished my paper last Sunday.

Be careful, _______ you'll fall down.

We must ______ that the experiment is controlled as rigidly as possible.

It is useful to science _______ the earth as an object in space.

________ with the size of the whole earth, the highest mountains do not seem high at all.

A baby might show fear of an unfamiliar adult, _______ he is likely to smile and reach out to another infant.

The student found the novel _______. It provided him with so much information about the subject.

Sorry sir, we don't have wine or beer. We are only licensed to sell _______ drinks.

Let's drink _______ Dicks' success in business.

The terrible noise is ______ me mad.

The engine has broken and the boat is ______ on the water.

Attendance at football matches have _____ since the coming of television.

Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.

When I came through the customs at the airport, I had to pay ________ on a clock I had bought.

I'm ______ to graduate in the next half of the year.

Take it ______. It is nothing but a joke.

Construction of the railways helped to develop the national _______ of Tanzania and Zambia.

Only a(n) ________ few were invited to the dancing party.

In the future, more ______ should be placed on the education of the young.

Sixty per cent of television viewers chose him as their _______ actor.

The farmer had to wear heavy boots in the winter because the fields were too wet and________.

As you like pop music, __________ I like literature.

I bought this eighteenth century writing desk at a quite ________ price.

He thoroughly understood the society __________.

To study a foreign language, __________.

It's more ________ to buy a season ticket if you travel every day.

The wealth of a country should be measured ________ the health and happiness of its people as well as the material goods it can produce.

She had clearly no ________ of doing any work, although she was very well paid.

For the new country to survive, ________ for its people to enjoy prosperity, new economic policies will be required.