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

My keys are in my bag.             keys under that desk aren't mine.

--Did you see Mary and her sister this morning?-- Yes, I saw _________ girls playing in the playground.

My grandparents have lived in a town near Nanjing 　　　. They enjoy their life in the town. 

–I like English best. What about _______?–He thinks science is very interesting. His favorite subject is science.