The sign "No Smoking" in the subway means passengers ____________ smoke.
can
should
mustn't
needn't
Look! The dress looks nice __________you and you really look pretty __________violet.
I felt so __________that I fell __________in the History class this afternoon.
My cousin gave me a nice toy. What sentence element is the underlined part?
It’s easy __________you to say sorry, but remember __________ be late again.
Students should pay attention to __________ the teacher in class.