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).