单项选择题
The purpose of lookout is to prove the （）(安全) of a ship.
A.stern B.safety C.saw D.spanner
单项选择题 Where is the （）(撬棍)？
单项选择题 please use the （）(拖把) to clean the floor.
单项选择题 The thinner can （）(稀释) the paint.
