"Mary, turn off the water_________you are brushing your teeth. " "Sorry, I'll do it at once. "A. until B. while C. during
The teacher went up to ask _________.
Tom became a soldier in _________. He was in ________ at that time.
He considered __________ the book, which was considered __________ a great help in his study.
The clothes in this shop are more beautiful than ____ of ______.
The meal mother cooked ______ very delicious.