He __________ (宣称) that he had finished the work.
如果你不带雨衣出去,你就要冒淋湿的危险,因为可能下雨。 If you go out __________ a raincoat you risk __________(get) wet, because it may rain.
我认为他住在那里,但我不敢肯定。 I think he lives there but I couldn't say __________ __________.
A surgeon is a doctor who does __________(外科手术).
The fuel that pa machine provides the energy that the machine needs in order to work.
He has a good __________(掌握,精通)of English.