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IV. Use the correct form of words in brackets.
1. There is still room for your (improve) **improvement** in your work.
2. Today scientific progress is mostly defined in terms of (technology) **technological** advancements.
3. The first experience was (succeed) **successful**, so we need to do another one.
4. (Research) **Researchers** in Japan have found that human ageing may be able to be delayed or even reserved.
5. The US (explore) **exploration** of the Moon began with the Ranger 4 impactor in 1962.
6. Thousands of (chemistry) **chemicals** are used in everyday products - in our water, our food and in the air we breathe.
V. Choose the correct answer A, B, C or D to complete the sentences.