___is the girl in a red jacket? —She is Sally, my sister.

You can come at any time this afternoon. I’ll wait for you ______ 6 o’clock. [ ]

He made another wonderful discovery, ______ of great importance to science.

Could you tell me_____ yuanxiao in china?— Usually at Lantern Festival.

This important lesson by Professor Wang teaches primary students how to ______ themselves from danger.