Children are always asking allkinds of questions because they are ______ about the world they live in.

Are you willing to live on Mars one day –_____ It sounds exciting， but it still worries me.

This passage had many new words and the students could not _______ what the writer meant

ouldn’t remember the exact date of thetyphoon, but he knew it was _____ Sunday, because everybody was at _____church

Mom, this is my teacher, Miss Lin. Miss Lin, ____