Complete the sentences with the Present Simple or Past Simple passive.
Colds are spread (spread) by sneezing.
Vitamin C ------ (discover) in 1747.
Toothbrushes ------- (invent) by the Chinese.
The people --------- (not take) to hospital after the accident.
A new medical centre ------ (open) in my town last year.
A lot of remedies ----- (make) from plants.
I ------ (not give) any medicine at the hospital.
My teeth ----- (check) twice a year.
Vaccinations ---- (not develop) until the 18th century.
I called for an ambulance but it ------ (not need).