In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (3)_____ in conversation and meetings are often (4)_____ .

He also telephoned his father at work, and then his grandmother, to explain what he had (2)_____ .

While waiting for these people to come, William looked after his 18–month– old sister. When ambulance man Steve Lyn went to the house, he was amazed. 'It's great that a young boy of six knew the right number to dial, and was able to give us the correct information. (3)______ of William's quick thinking,

Mrs. Baldock left hospital yesterday, very (5)_____ to both William and the ambulance service.

The central mission of a library is to collect, organize, preserve, and provide access to knowledge and information. In fulfilling this mission, libraries preserve a valuable record of culture that can be passed down to (2)______ generations.

Many species of animals are threatened, and could easily become (2)_____ if we do not make an effort to protect them. There are many reasons for this. In some cases animals are hunted for their fur or for other valuable parts of their bodies.

Farmers use powerful chemicals to help them grow better crops, (4)_____ these chemicals pollute the environment and harm wildlife.

Employers will generally look favorably on people (5)_____ have shown an ability to work as part of a team. It demonstrates a willingness to learn and an independent spirit, which would be desirable qualities in any employee

This happening is called El Nino and is used by weather forecasters to make long-range weather predictions. They also know that El Nino will unusually bring heavy rains to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters used to know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be (4)_____ .

There is usually one important subject missing from most school. Very few students are taught how to organize their learning, and how to (1)_____ the best use of their time. Let’s take some simple examples. Do you know how to look up words in a dictionary, and do you understand all the information the dictionary contains? Can you (2)______ notes quickly, and can you understand them afterwards? For some reasons, many schools give learners no (3)_____ with these matters. Teachers ask students to memorize pages from books, or tell them to write ten pages, but don’t explain how to do it. Learning by heart can be useful, but it is important to have genuine understanding of a subject. You can waste a lot of time memorizing books, without understanding anything about the subject.

(3) _______ the nationally regulated and financed education (4) _______ of many other industrialized societies