---Can you work out the maths problem? ---Sorry, I can ______ understand its meaning.
(原创)Can your sisiter clean her room ______ weekdays?
(原创) Wang Lin, ______be noisy in class!
Now I'm at the ______.I'd like to buy a skirt for my daughter.
It's twelve o'clock now. The Greens ______ lunch at home.
—______ do you go to the supermarket? —Because I want to buy some vegetables.