单项选择题
A. We must use all kinds of tools carefully and return it after using. B. We must use every tool carefully and return it after using. C. A+B D. We must use everything carefully and keep it after using.
A. The thinner can thin down paint. B. The thinner can clean. C. The thinner isn’t the paint. D. The thinner is the paint.
A. The bridge is very clean. B. The bridge is the ship's eye and ear. C. The bridge is at the stern. D . The bridge is at the bow.