Someone is ringing the doorbell. Go and see ___________.
I still remember to the Famen Temple and what I saw there.
The best means to go there _________walking.
He is determined to become a specialist ________ computer when he grows up.
The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck.
They argued ________each other _________ where to spend the golden week.