—Thomas, where are my postcards? I _____ find them.
—They’re on the bookshelf.
can’t
needn’t
mustn’t
shouldn’t
This blue pen is .
Look! Some ______ are in the school.
--Are those the ______ books? -- No, they are ______ books.
--______ are they? --They are my ______.
These two are on the chair.