Naturally, parents are curious to find out why the Internet is so attractive, and they want to know if it can be (2) __________ for their children. Should parents be worried if their children are spending that much time watching their computers?

A. harming           

B. harmful                  

C. hurting                   

D. hurtful

A. harming (v): làm hại                                     

B. harmful (adj): có hại                                        

C. hurting (v): làm tổn thương                                 

D. hurtful (adj): tổn thương

=> Sau động từ “tobe” cần 1 tính từ, xét về nghĩa => chọn B