I think the most helpful invention is light bulb. It seeing in the dark, and it gives people more time to work and play every day.A. used to B. is used to C. is used for
—I’m going to Hawaii with my uncle this month for my holiday. —______!
Mr. Wang often ________ his dictionary in the library.
— gloves are these? —Sorry. I don’t know.
________are in the same class. We are good friends.
______Jenny is kind, ______we all like her.