__________ the crisis of economy getting more and more serious, the government is searching for ways to improve people’s life.
There was a terrible noise _______ the sudden burst of light.
The sentence needs _______ once more.
The computer centre, _______ last year, is very popular among the students in this school.
Rather than _______ on a crowded bus, he always prefers _______ a bicycle.
_______a reply, he decided to write again.