-- I haven’t got the reference book yet, but I’ll have a test on the subject next month. -- Don’t worry. You ______ have it by Friday.
We already have ______pencils, but we need two ____ pens.
Why are you leaving right now? You promised to stay ____ hours.
We asked John and Jerry, but ____ of them could offer a satisfactory explanation.
This book______18 articles , _______ three written by my father.
Chest pains can be a warning ____of heart problems.