Did you spend 20 dollars ________ this computer game

＿＿＿＿＿ Betty this morning? —— Not yet, but she is sure to be here before noon

Why do you like that band—Because they play ________ their own songs.

It’s the protection for the trees ___ really matters, _____ how many trees are planted each year.

They all looked _____ me _____ surprise, but I didn’t know why