Some of the students are not sure ___ spelling the word, while others are not sure ___ the use of some grammatical rules.
—What about the books ? —Books of this kind _____ well .
The schoolboys and schoolgirls are walking along the street, _____a small redcap .
When the injured _____ to the hospital , they came to .
The government’s efforts to cut the homework burden of primary and middle school students _____ mixed reactions(反应).
Nobody but the twins _____ some interest in the project till now.