In order to find the missing boy, the young couple all they can over the past twenty-four hours

he studied hard every day, hedidn’t pass the exam.

have you seen my mobile phone—______ you bought last week I’m afraid Ihaven’t seen _____．

Who’s singing in the bathroom— It ________ be Mr. Brown. Nobody sings like that except him.

I’d like to______a doctor’s appointment as soonas possible. [ ]