After the World War II, the United Nations has been actively carrying out its convention to stop wars and bring peace to nations worldwide.

______ in 1520,Cambridge is one of the most famous universities in the UK.

_______ in Hanoi for many years,my grandfather knows it very well.

___________ in the hospital for 4 years,he decided to give up his work.

_____ the house suddenly she found them smoking.

_______the report on how the burning of petrol in cars contributes to climate change,we decided to sell our car and get a bicycle instead.

______ this film many times,I didn’t want to watch it again.

_______her lunch,the teacher began marking the essays.

_________the fire,Martina telephoned the fire department.

_______ a scholarship,I entered one of the most privileged universities of the United Kingdom.

_______ the dinner for her family,she watched a film and waited for her husband to come home from work.

_____ by his work,he threw himself on his bed. 

______ the film before,I didn't want to go to the cinema.

______ an hour,the crowd were getting impatient.