一I can’t find my pen．Could you lend me ________   ?—Sorry，I’m using it__________．

We find     impossible forus tolearna foreignlanguage wellina shorttime.

— Can I use your notebook computer this afternoon? ________ is under repair.— No problem. 

—Is this          pen, Tim? —No. It’s Mary’s.

Though the passage is easy, I don’t think __________can understand it.