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People, especially teens, think it ?????? great fun to surf on ?????? Internet.

A. a; the????????? B. a; /?????????? C. /; the????????? D. the; the

People, especially teens, think it __ great fun to surf on _____ Internet.

A. a; the   B. a; 不填  C. 不填; the    D. 不填；不填

People, especially teens, think it _____ great fun to surf on _____Internet.

A. a; the    B. a; 不填     C. 不填; the    D. the; the

People, especially teens, think it         great fun to surf on         Internet.

---People, especially teens, think it_______ great fun to surf on________ Internet.

--- I agree with you.

A. a; the               B. a; /         C. /; the           D. /；/

---People, especially teens, think it_______ great fun to surf on________ Internet.

--- I agree with you.

A. a; the                   B. a; /             C. /; the               D. /；/

---People, especially teens, think it________ great fun to surf on________ Internet.

--- I agree with you.

A. a; the　　　　　　　　　　　　　 B. a; /　　　　　　　　　 C. /; the　　　　　　　　 D. /；/