Sorry, I can’t find the key ______ the lock. How can we open the door?[ ]

This library has available _____ you want to borrow for your school．

Did Aunt Li buy a skirt last Sunday?— Sure. She chose_________ one of the two green skirts.

! What`s that ? – I can`t it .

Can I help you?—Yes, I bought this radio here yesterday, but it _____________.