单项选择题
A. I usually keep watch on the bridge. B. I often do some repair work on the forecastle. C. I often paint on deck. D. I often do some repair work on the bridge.
A. Put rat guard on the deck. B. Put rat guards on the moorings. C. Put rat guard under the moorings. D. Put rat guards under the moorings.
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.