-- Is that girl Susan?-- It ______ be her. She left for Beijing yesterday.A. needn't B. can't C. mustn't
Sixteen-year-olds shouldn’t ______ to go to an Internet bar.
The more careful you are, ________ mistakes you will make. I think it’s true.
---I wonder ___________. ----It’s next to the hospital.
If you don't know the word, you can _____ in the dictionary.
__ is really hard __ them to climb Mount Tai.