I study math by ____ lots of exercises. A. did B. doing C. do
— _____ do you study for a test?— _____ studying with a group.
— Jenny is a quiet girl, she likes playing _____ violin, but she hates playing _____ soccer.
— Kitty, do you know ______?— Sure, about forty minutes.
The rest _______ the money _______ to be sent to him.
----- I don’t think teenagers should drive cars.-----_________. They aren’t serious enough.