I think the most helpful invention is light bulb. It seeing in the dark, and it gives people more time to work and play every day.A. used to B. is used to C. is used for
—Do you like swimming? —Yes, swimming is a good way _______ fit.
—Would you like to climb mountains with me this Sunday? —I’d love to. But I _______ play table tennis against Class Three.
——Your watch is so beautiful. It must be expensive. ——Not at all . I only _____$20 on it. A take B. pay C. cost D. spend
Do you know the _____ between these two words?
When did you finish _____ the book last night?