Сделайте эти предложения пассивными. 1. They weigh and measure the birds in autumn every year.
2. They buy dictionaries for philology classes in London.
3. They make these souvenirs by hand.
4. Doctors examine patients in this room.
5. My parents give me pocket money at the beginning of each month.
6. Granny grows beautiful roses in her garden.
7. They mow grass every week.
8. People never approve of such behaviour.
9. Every year they contribute large sums of money to this medical centre. — Large sums of money are contributed to this medical centre
10. People sometimes steal books from libraries.

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Today is a 21st century. Nowadays, people can have access to everything that they want and do not want to know.
About 20 years ago, children and adults didn't have computers with internet and mass media was had some frames about information that is allowed for everybody. As for now, sex, drugs and cigarettes become normal things that can be propagandized in movies, advertisements and so on.  Because of this "freedom", children become adult faster than it was before.
        If it was normal to start having sex at 18-20 years old in the past, so for now, teenagers have their first experience at 14-17 in average. But we can not say that girls at this age can be prescribed contraceptives due to the fact that it is a hormone interfere and it can harm the health. Actually, not every girl is allowed to use contraceptives because it depends on individuals. Moreover, these pills must be ascertained by doctor permission.  
           Therefore, the best option is to abstain having sex at so early age or, in other case, to use condom. 

1. Somewhere in the world a volcano erupts every two minutes.2 The most powerful earthquake onrecord (9.3 on the Richter scale) occurred in Greece. 3 The city of Venice has been destroyed by floods more tnan twice in its hictory.4 In Australia forest fires are necessary for trees to reproduce.5 The Sahara is the largest desert in the world.6 The Amazon is the biggest rainforest in the world. 7 The African elephant is an endangered species.8 All snakes are a protected species in Australia, which means it is illegal to kill them.9 The natural habitat of the tiger Africa. 10 The Tasmanian Tiger, which became extinct in the 20 th century, is in fact a type of dog.