It is playing computer games he spends so much time that he fails all the exams
His parents always advised him____ too much time on the computer, but he still sticks to doing it.
The soldiers were fighting bravely their people _____ the invaders.
Two dogs_____ a bone, and a third one ran away with it.
Though he failed in the exam this time, he did not .
Mrs. Brown went to the doctor’s because she had some trouble_____ her heart.