Запуталась с заданиями, и ответы не сходятся​

1. Вам следует усердно работать, чтобы подготовиться к своим экзаменам.

You have to work hard to get prepared for your exams

2. Если вы хотите составить свои экзамены успешно, берите ответственность за свое собственное обучение.

If you want to pass your exams successfully, take responsibility for your own studying.

3. Мы не знаем точно сколько людей изучает иностранные языки.

We don't know exactly how many people study foreign languages.

4. Ты веришь в суеверия?

Are you superstitious?  

5. Если ты истощен, выбери музыку, которая заставит тебя расслабиться.

If you are (emotionally) drained, choose the music which will make you relax.

1. If number of speakers decrease, some languages will be endangered.
2. If Internet reaches all corners of the world, English as the Net language will influence the culture of non-speaking countries.
3. If English keeps on being global, other languages won’t set foot on Internet. 4. The world’s linguistic experts will be alarmed if many languages disappear at an alarming rate.
5. If some tribes aren’t urbanized and assimilated into mainstream, their languages won’t die out.
6. Youngsters will be able to communicate with people from abroad, if they learn foreign languages.
7. If the EU wasn’t worried about endangered languages, they wouldn’t issue a special directive on preserving them.
8. If minority languages aren’t politically tolerated, they will be in jeopardy.
9. If the high number of languages spoken in the EU corridors, it would be like a Tower of Babel.
10. If English is the language of trade and diplomacy, it will be considered as lingua franca nowadays.