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My teacher said that these sentences isn't academic, I have to rewrite them int more professional. I have done some sentences, but there are some difficult ones left. Here is my result. Please help me correct my rewritten sentences and cue me the rests. Here are them:

1. Sadly, serious crime like murder is going up.
->Serious crime such as murder is going up.

2. You can't always trust the numbers in that report.
->It is suggested that you should not always trust the number in that report.

3. You can't always trust the numbers in that report.
-> It is suggested that you should not always trust the numbers in that report.

4. The second thing is that most kids in that district will become criminals.
-> There is a fact that most kids in that district will become criminals

5. I think that there's a big risk of more strikes, disorder etc.
-> There is a big risk of more strikes, disorder and so on.

6. A few years ago, women were allowed to vote
-> A few years ago, women were allowed to vote.

These are these sentences done and Here are the rests:
7. Regrettably, the inflation in Russia led to inceased poverty,illness.

8. Some time soon they will find a vaccine for malaria.

9. What were the main causes of the American Revolution?

One more thing, she also said that these two short paragraphs isn't written in academic way. Here is the original and rewritten ones:

1. These days a lot of kids are starting school early. Years ago they began at 5, but now it's normal to start at 4 or younger. Why is this? One thing is that mums need to get back to wrol. Is it good for the kids? Jenkins has studied this and says that early.

->

There are many kids are starting school early these days. Years ago, they began at 5, but it’s normal to start at 4 or younger. Why is this? One thing mothers need to get back to work. Is it good for the kids? Jenkins has studied this and says that early.

2. Why are there so many jams on the roads these days? One thing is that public transport like trains, buses, etc. is so dear. A long time ago cars cost a lot but now, unfortunately, they' ve got a lot cheaper. Another thing is that driving is a lot nicer than witing for a bus. The trouble is that if everyone buys a car the roads get packed.

->

Why are there so many jams on the roads these days? One thing is that public transport like trains, buses and so on is so dangerous. A long time ago cars cost a lot, but they have got a lot cheaper now. Another thing is that driving is a lot nicer than waiting for bus. The trouble is that if everyone bys a car the roads get packed.

Please help me. Thanks a lot.
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You need to use vocabulary of a more formal register. Here are the 1st two revised:

1. Sadly, serious crime like murder is going up.
->Unfortunately, felonies / capital offenses are increasing.

2. You can't always trust the numbers in that report.
->The statistics in that report are unreliable.

Now, please try again with your other sentences.
Comments  
I would avoid words that show your personal feeling like sadly, unfortunately, luckily...