—________ are these sports socks?
—10 yuan for 3 pairs.
How many
How much
How often
How long
On Sundays, I want to do ________.
It took them three hours ___ homework.
This is _____ pen and ________ is in the pencil-case.
— ______ do you go to the movies? —Once a month.
The baby kept ________and the mother felt_________________ .