After graduation, Frank often thought of those who had helped him ________ his school life.
It was in this village _______ he saved 11 people _______ were trapped in the flood.
I Peter at once although I hadn’t seen him for 10 years
On Christmas Day, children have __ ___ singing, dancing and playing games.
The report indicates that the new power station produces energy as the one built earlier.
So far there is no proof people from other planets do exist.