27. ---I don’t suppose she could have done well in the exam last week,_____ she? ---_____, she almost failed to pass the exam.
We’d better hurry. Our teacher ________ us.
The teacher as well as the students _______planting trees.
_______ is known to all, smoking is harm our health.
__surprised me most was ___ Mary spoke Chinese just like a native speaker.
--- Would you mind my opening the window. It is too hot. ---- .