The house caught___fire last night but no one knows who set ___fire to it.
A. X；X    B.X;a   C, a; a   D, a; X

As a great painter, he had          eye for      colour.

Babies are not born with __ moral sense; they cannot tell __ difference between right and wrong.

 – Why not take _______ friend with you? Then you can share ______ cost of the car.
--- That sounds like a good idea.

What ______ public is concerned about is whether medical workers and scientists will be able to find _____ cure for this new disease in a short time .

______ Mr. Brown is waiting outside to see you . He appears to be quite ____ important person.

It is quite apparent that the aging population in China will cause _____ heavy pressure on ____ whole society in the future .

As with ____ businessmen , most teachers have ____ very busy life nowadays .

You made the same mistake for ______ third time , dropping _____ “r” in the word “ government” .
A. a, the   B. a , an  C. the , an   D a, a

--Where is your brother?
---I think he is still in_____bed,but he might just be in______bathroom.