was discovered
were invented
were not taken
was opened
are made
was not given
are checked
were not developed
was not needed
1. 1) mustn’t
2) mustn’t
3) must’t
4) must
5) must
6) must
2. 1) must
2) don’t have
3) could
4) mustn’t
3. 1) had to
2) must
3) had to
4) must
4. 1) have to
2) must
3) had to
4) has to поскольку нет правильного варианта в задании
5. 1) should watch
2) should go
3) should clean
4) should visit
5) should wear
6) should read
6. 1) I think everybody should wash their hands
2) I think you should wake up earlier
3) I don’t think you should buy this expensive dress
7. 1) They don’t have to write a composition
2) I don’t have to work anymore. I won the lottery
3) We mustn’t talk loudly. This is a hospital
4) I have an exam tomorrow. I must study
5) Sara can sing very well
8. 1) You have to go straight 100 m and then turn left.
2) You should take a bus 5
3) You should turn left, then go straight and cross the road.
Объяснение:
Vitamin C was discovered in 1747.
Toothbrushes were invented by the Chinese.
The people were not taken to hospital after the accident.
A new medical centre was opened in my town last year.
A lot of remedies are made from plants.
I am/was not given any medicine at the hospital.
My teeth are checked twice a year.
Vaccinations were not developed until the 18th century.
I called for an ambulance but it was not needed.