– How do you study for a test? -- _____ working with friends. A. By B. With C. On
When I traveled in Thailand , I bought a ring . It __________ silver .
Judy used to be ____. Now she’s very shy.
Every year, we plant many trees on _______ side of the road to make our city more beautiful.
If there are ______ trees, the air in our city will be _______ cleaner.
You shouldn't ____ the boy's mistakes.