14. The world is changing every day. ______ a happy life, we need to learn how to change our ways.
The hurricane was________powerful that quite a lot of big trees in our town were knocked over last night.
I might fail,but________I insist on doing it.I never lose heart.
—How did you pass the challenging test?—It was a long time________I found a series of suitable methods.
Because of H7N9 bird flu,all the chicken markets in Shanghai have been closed and won’t open until further________.
Hiking by oneself can be fun and good for health.It may also be good for________building.