He was _____ upset by the accident.
This is the use which we made_____sea resources.
I'11 never forget the days _____ I lived in the country with the farmers,_____has a great effect on my life.
Something will have to be done about the air pollution,_____?
Is this the museum _____we visited last year?
Though they are not very sure of the long-term ,all the scientists agree to start_____,all the scientists agree to start the research immediately.