The ice changed ____ water ____ warm air around .
I seldom take _______bus to school. I always go to school by _______bike.
---I failed in the exam again. I am sorry to let you down, Mum.--- , dear. I know you’re doing better now.
The weather in Beijing is colder than in Guangzhou.
The number of the students in our school ______ 260, and a numberof them ______ from the countryside.
---When will the plane arrive Shanghai?--- the morning of March 13th .