Peter ________ at this job since he graduated from college.
---When can I come for the English books? I need them tomorrow afternoon. ---They ______ be ready by half past eleven.
The young man is a person of great perseverance(毅力), from which he ______ a lot.
---What will you do next Sunday? ---Maybe do some shopping, for I ______ go to school on Sunday.
As we all know, no one is perfect, and everyone has his own ______.
It was playing computer games that cost the boy plenty of time that he ______ have spent studying.