Those trees ______ last month. Now they ______.

People say that the bridge was destroyed in the war.

As personal incomes grow and vehicles become more affordable, problems associated with pollution have emerged like a major urban issue.

Several developed countries have had a rapid decline in fertility because many women there have delayed to have children.

Many years ago, the climate of North America became such cold that great sheets of ice covered most of Canada.

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Vietnam faces a challenge which it is the rapid increase of motor vehicles, particularly     in the big cities.

I speak English ______.

Man is damaging the balance of nature which regulates climate and the atmosphere, produces and maintain healthy soils, provides food from the seas.

It is estimated that the population of Vietnam will reach 100 million for the next 25 years and will stabilize at 120 million by the middle of this century.

On the first of next month, John ______ for that computer company for five years.

How about going to ______ Netherlands next ______ summer?

Jennifer and I went to the mall to buy a blender, ______

After months of colder weather, the days get longer, the buds come out in the trees, birds sing, and the world put on a green dress.