He hasn’t decided _____ he will go abroad next year.
Considering his health, I advise him to ______ an hour or two each day to work out.
Riding bikes has advantages __________ driving cars ________ many aspects.
How can we get this language point _____ to the students.
We' ve published large quantities of books. This year___ we've published three million.
Why not look up the new word in a dictionary _____ you don’t know it ?