Do you always spend a lot of time ____ computer?--- No,but I spent much time ____ my homework
Do you always spend a lot of time ____ computer?
--- No,but I spent much time ____ my homework 
 \x05
A.\x05
on; doing 
 \x05
B.\x05
in; doing 
 \x05
C.\x05
on; to do 
 \x05
D.\x05
in; to do