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Is      necessary to complete the design before National Day?

A.this          B.that        C.it       D.he

Is      necessary to complete the design before National  Day?

A. this        B. that       C. it           D. he

 Is __________ necessary to complete the design before National Day?

   A. this      B. that      C. it      D. he

Is ____ necessary to complete the design before National Day?

A. this  B. that　  C. it　  D. he　

Is ____ necessary to complete the design before National Day?

A. this  B. that　  C. it　  D. he