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________ in simpler words?

He put the two letters into the wrong envelopes ______ mistake.

............. research team is an effective way to prepare for class preparation of social studies such as history, geography, literature and economics.

Their massive salaries let them afford to give .............. huge amounts to Charities.

The‌ ‌bus‌ ‌company‌ ‌__________‌ ‌the‌ ‌threat‌ ‌it‌ ‌had‌ ‌received,‌ ‌and‌ ‌so‌ ‌it‌ ‌checked‌ ‌all‌ ‌of‌ ‌its‌ ‌buses‌ ‌for‌ ‌explosives.‌ ‌ ‌

Choose the best answer:
The education system is a mirror that reflects the culture.

A skilled population is the key ..............  a country's sustainable development and stability.

The instructor blew his whistle and .............

Today the move away from rigid rules makes it much easier (1) ________ the right way to behave because there are fewer out and out ‘wrongs’. Of course there are still a few situations where inflexible rules (2) ________, although these are mainly concerned with official functions. But nine times out of ten, the way you choose to behave is (3) ________ you, with one very important proviso: that you keep firmly in (4)________ the basis (5)________ etiquette has grown up; in other words, the need always to consider other people's feelings first. 
Some people, for instance, are very informal and outgoing by (6) ________, while others prefer to be more reserved and formal. Younger people tend to be less formal than their parents. Habits can (7) ________ in different parts of the country. Behaviour which may be commonplace in the capital - like arriving later than the stated time - can often be unconventional (8) ________. Just remember the basic rule of consideration for others, and when in doubt, follow the example of those around you. Etiquette is a skill that is easily learned and it brings the benefits of other people's appreciation whenever you (9) ________ in practice. It's a pleasure to spend time with people who are reliably courteous and (10) ________; it's also pleasant to feel that you will always know what to do or say in any circumstances, mundane or extraordinary
(3).....................

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A package __________carefully before it is mailed.

Choose the best answer among A, B, C or D that best completes each sentence:  “How did that window….. ?” “I don’t know.”

Identify the error in each sentence: Regardless of your teaching method, the objective of any conversation class should be for the students to practice speaking words

Jane had intended to spend eleven hours a day studying in the three months before the exam, but she found that she couldn’t __________ her plan. 

I would not have read your diary if you _    it in such an obvious place.

Your daughter's just started work, hasn't she? How's she getting _____?

Choose the best answer:
If desired, garnish your plate with parsley, bell pepper rings or other vegetables.

Tom had finished the exam when the teacher _________ the papers.

Read the following passage and choose the best answer for each blank.

As well as being a necessary life-saving skill, swimming also (26)________us with a source of great pleasure and relaxation. Swimming, as well as other water sports like diving, surfing or just floating on your back, are some of the best ways to have (27)________and keep fit at the same time. Water sports are enjoyable for people of (28)________ages and even babies can learn to swim.

For elderly people or (29)________with physical handicaps, swimming provides gentle, yet effective exercise. Swimming for fitness and recreation has been popular (30) ________the earliest times, for instance in ancient Egypt, Greece and Roma. Swimming competitions developed in the nineteenth century and swimming races were (31)_______ in the first of the modern Olympic Games in 1896. Now water sports are (32)________ all over the world and most towns have at least one swimming pool.

Most water sports - swimming, surfing and water-skiing, etc, take (33)________on the surface of the water, but scuba divers explore deep below the waves.

There they can find fascinating sea creatures and strange rockformations. Some archaeologists are divers. (34)________search the seabed for wrecks of ships sunk hundreds of years ago which (35)________ objects that show how people lived in ancient times.

(26)________

Identify the one underlined word or phrase that must be changed in order for the sentence to be correct.

The dogs in the circus were trained to walk on their ........ legs.

Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions: 

The 1923 earthquake in Japan killed about 200,000 people and left countless wounded and homeless.

Drying flowers is the best way  ................   them.