There are no customers in the hotel. It ______ have the friendliest service.

  —The winner is a tall and thin boy with glasses!—Well，it________ be Mike.  He doesn’t wear any glasses.

 ---  ________ have you kept the book ? --- Since last Month. I ________ return it to the library today or I can’t borrow one next time. 

--It is really fun to hike and I often go hiking in the forest.--But hiking alone in the forest ______ be very dangerous.

 —Mom, I did not pass the exam.—What a pity! You     it.