I don’t want to buy this pair of black shoes. I want to buy ________.

I must return the book to the library. I _____ it for one week.

I find ________ difficult to remember everything, though I’m still young.

I have two story-books. One is for you and ______ is for your sister.

．—Has your father finished his report?—Sorry，I don’t know．He ________ it this morning．