We take having an endless supply of clean water             , and may suffer from that sooner or làter.

Immigrants faced             , and were paid considerably less than their white colleagues.

             she joined the company only a year ago, she's already been promoted twice.

Many minority groups are struggling to maintain their cultural            .

In generally, social networking sites are good for our society because they help to connect people.

              kangaroos are large marsupials that are found only in Australia.

The last time I went swimming was when we were in Spain.

Moving to London was a bit of a            after ten years of living in his country

She needn't rely any more            Rico - or her brothers, she could be entirely independent

The            are sources of information and news such as newspapers, magazines, radio and television, that reach and influence làrge numbers of people.

The temperature dropped suddenly last night,            means that the shoots emerging from the soil will be killed by the frost.

He             in the library for three hours and he needs a rest.

“Why don’t you take a break and finish it later?” said Jenny to Alan.

              foods are produced through farming practices that only use natural substances. This means avoiding all artificial chemicals, hormones, antibiotics, and GMOs.

These social "rules" are (50)           for two men, two women, a man and a woman, or an adult and a child.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Different cultures follow their own special customs when a child's baby teeth fall out. In Korea, for example, they have the custom of throwing lost teeth up on the roof of a house. According to tradition, a magpie will come and take the tooth. Làter, the magpie will return with a new tooth for the child. In other Asian countries, such as Japan and Vietnam, children follow a similar tradition of throwing their lost teeth onto the roofs of houses.

Birds aren't the only animals thought to take lost teeth. In Mexico and Spain, tradition says a mouse takes a lost tooth and leaves some money. However, in Mongolia, dogs are responsible for taking teeth away. Dogs are highly respected in Mongolian culture and are considered guardian angels of the people. Tradition says that the new tooth will grow good and strong if the baby tooth is fed to a guardian angel. Accordingly, parents in Mongolia will put their child's lost tooth in a piece of meat and feed it to a dog.

The idea of giving lost teeth to an angel or fairy is also a tradition in the West. Many children in Western countries count on the Tooth Fairy to leave money or presents in exchange for a tooth. The exact origins of the Tooth Fairy are a mystery, although the story probably began in England or Ireland centuries ago. According to tradition, a child puts a lost tooth under his or her pillow before going to bed. In the wee hours, while the child is sleeping, the Tooth Fairy takes the tooth and leaves something else under the pillow. In France, the Tooth Fairy leaves a small gift. In the United States, however, the Tooth Fairy usually leaves money. These days, the rate is $1 to $5 per tooth, adding up to a lot of money from the Tooth Fairy!

What is the passage mainly about?