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We need essential minerals in our diet. (Essential minerals)
Essential minerals are needed in our diet.
The Centre for Cancer Research announced a breakthrough recently. (A breakthrough)
A breakthrough was announced recently by the Centre for Cancer Research.
They have sent Professor Clark a thank-you letter. (A thank-you letter)
A thank-you letter has been sent to Professor Clark.
People will eat a lot less sugar in the future. (A lot less sugar)
A lot less sugar will be eaten in the future.
By the late 1960s, Dr Christian Barnard had carried out the first heart transplant. (The first heart transplant)
The first heart transplant had been carried out by Dr Christian Barnard by the late 1960s.
Many people know that saturated fats are bad for your health.
Saturated fats ...
Saturated fats are known to be bad for your health.
A think tank estimates that half the population will soon be overweight.
It...
It is estimated that half the population will soon be overweight.
People think the native islanders died from malnutrition.
The native islanders ...
The native islanders are thought to have died from malnutrition.
Somebody should have carried out the study more carefully.
The study ...
The study should have been carried out more carefully.
Should we criticise doctors when we are responsible for our own diets?
Should doctors be criticised when we are responsible for our own diets?
Paracetamol _______________________ (discover) in 1877
was discovered
Paracetamol _______________________ (use) ever since.
has been used
Today, in Europe and the USA, paracetamol _______________________ (often / prescribe) to treat fever and pain.
is often prescribed
