In a sports team each player has a clear role,and there are few _______when members are uncertain of their roles. A.occasions B.positions C chances D.situations
----when are you going off for your holiday? ----My plane ______ at 9:20, so I must be at the airport by 8:20.
After the teacher called him into the office, the boy admitted _______ in the test.
It was in Beihai Park _____ they made a date for the first time ______ the old couple told us their love story.
.Only when your identity has been checked ________.
More and more people are beginning to _____ importance to living a low-carbon(低炭) life.