a) Another thing to think about is the chance of crime getting worse.
Another issue to consider is the possibility of crime increasing.
b) Regrettably these days lots of people don't have jobs.
Regrettably, nowadays the rate of unemployment is rising.
c) Sometime soon they will find a vaccine for malaria.
A vaccine for malaria may be found soon.
d) A few years ago the price of property in Japan went down a lot.
After 2000, Japanese property prices are increasing.
e) You can't always trust the numbers in that report.
The numbers in that report are unreliable.
f) Sadly, the high inflation led to poverty, social unrest and so on.
The high inflation caused poverty and social unrest.
g) He was over the moon when he won the prize.
He was delighted to win the prize.
h) I think we should pay students to study.
Students should be paid for doing their job.
i) A few years ago they allowed women to vote.
Women were allowed to vote in 1987.
j) What were the main causes of the Russian revolution?
The main causes of the Russian revolution were war and misgovernment.