1 . ___________ it is learning in school through computer or relaxing at home with video games and TV, time spent on screens has become an essential part of modern life.

A．Because

B．While

C．Whether

D．As

2 . I would appreciate____________ if you could help me out when I am in trouble.

A．that

B．one

C．it

D．this

3 . It’s no use ________ without taking action.

A．complain

B．complaining

C．being complained

D．to be complained