Why did you ________ the boy’s help just now—I can’t ask others for help as long as I meet a difficulty. I need to learn to help myself out.

I have ________ in learning English and I’m so worried. Could you help me with it—Sure.

I want to know ______ for theclass yesterday morning.

When did your father ____ your mother

You’d be exposed to a lot ____ pollution if you moved to a town with pure water and air. [ ]