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

— If you listen to me, you ______ take a good rest at once.— OK, I ______ do so.

Mr.Bush is on time for everything.How ________ it be that he was late for the opening ceremony.

— Where’s Lucy ? —  She ________ in the office. I saw her there just now.

 I didn’t know Headmaster Weng was away for Beijing. I       to his office yesterday.