Happy _____ they were, there was something missing.[ ]

Millie was invited to the party .How lucky!—Well, she not come. She is not sure whether her mother will allow her to.

Sam, what do you think of Legend of Mi Yue(《芈月传》)—_______ It’s too boring.

The factory used 65 percent of the raw materials, the rest of which _______ saved for other purpose.

It is in the school ______ he studied ten years ago ______ he gave a wonderful speech.