_______you study hard,you’ll succeed in time.
34. I thought it a pity __________ him to the tea party.
33.A reward of 1,000 dollars will be given ________ can find the lost child.
32.So often ______ in recent years that it has almost become a rule.
31.The farmer who admitted ______ the tiger was severely punished.
30.They ______ be at home. You see, the door is locked from the outside.