We find impossible forus tolearna foreignlanguage wellina shorttime.

The girl is too young to look after __________. You shouldn’t leave her at home _________.

This type of MP4 is my favorite, but I can’t ______ it.

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

He was away for a week. What happened _______ him?[ ]