— Must we finish our homework today?— No, you ________.A.can’t B.mustn’t C.don’t have to
---I would like to sit in _______ front of the bus. ---Me,too. And we can have__________better view.
--If I work hard at my lessons from now on, can I do well in them? ---Sure. ___________.
--- Kitty, do you know ______? ---Sure, about forty minutes.
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
When the sun ___ in the east, the little hero tried hard ___ the red flag to the top of the pole.