Waste paper shouldn’t everywhere. We must keep our school clean.
This listening material, together with its CD-ROMs, ______ well.
Lisa is a little poor at Chinese. I think she needs _____ it every day.
Of all the students in our class, she is ____.
----What’s the matter with you and your friend? ----She looks very busy. I want to help her, but I don’t know _____.
-----The light in the office is still on. -----Oh, I forget to _____.