Page 146 - Grammar For YDT - 12

Exercises - Relative Clauses

A) Rewrite the sentences by combining them with a relative pronoun.
1. Researchers published an article in scientific journals claiming that Saturn had another large moon in the distant
past. They work at various universities in the USA.
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2. We use some pills to relieve the pain in our bodies. They discover the painful area of the body as a result of
chemical processes.
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3. Horses have five different sleep stages, some light and some deep. Horses’ extraordinary ability to sleep standing
up protects them against predators in the wild.
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4. The ancient city of Myndos has been unearthed on Rabbit Island. The island is close to the shore.
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5. 3,300 BC is an estimated year. Writing was invented then.
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6. Users choose mobile apps. The reason is to make their lives easier and find solutions to their problems.
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B) Combine the sentences by using a relative pronoun. If appropriate, use the preposition before the
relative pronouns.

1. For long-lasting friendships, it is important to find someone safe. You can share your thoughts and feelings with them.
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2. Researchers especially focused on speed. The brain readjusted its activity to treat unknown words at this speed.
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3. Electricity is an important energy source. We depend on it to run civilisation.
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4. China is Saudi Arabia’s main client. It imports 70 billion dollars worth of oil per year from it.
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5. Nannies must commit to making a positive difference in the lives of the children. They care for them.

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C) Write the correct relative pronoun.

Octopuses 1. .................... neurons are spread throughout their bodies and not just in their heads are really interesting
creatures. It is known that there are 100 billion neurons in the human brain; however, in octopuses, there are around 500
million. Their best-known ability is to quickly adapt to their environment and change colour and shape in an extremely
short time, 2. .................... is usually a second. The secret of this amazing skill is hidden in their blood. The pigment
called hemocyanin, 3. .................... gives the octopus’s blood its blue colour, also helps it survive in harsh surroundings
4. .................... different kinds of predatory fish hunt. Unlike iron in our blood, hemocyanin protein contains copper
atoms. As octopuses have three hearts, they need more oxygen than usual. The copper atoms in hemocyanin also
have the ability to bind with a large number of oxygen atoms. Therefore, this substance, 5. .................... is found in
the bodies of some invertebrate animals, is able to meet the oxygen needs of their bodies at a high level. Researchers
6. .................... focus on these interesting animals think that the reason 7. .................... they developed the “blue blood”
adaptation is the fact that octopuses are a species 8. .................... cannot migrate far. Thus, they easily adapt to even
harsh conditions and do not need to change their location.

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