If you want to learn English well, it’s useful to _____ before class and _____ after class.A.review, previewB.preview, reviewC.review, to preview
A smile costs _________, but gives so much. So we should learn to smile.
My mother often tells me ______ the teachers carefully
Look, Jim _______ football on the playground.
---Why did you laugh just now? ---Ted wanted to tell us _____ very funny story, but he forgot ______ ending himself.
We should always be _________ the people who have helped us in our lives .