If you are going to walk in the mountain, strong boots are e __________.
他家揭不开锅了,孩子们都饿着。He has run __________ __________ food; his children are hungry.
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 p a machine provides the energy that the machine needs in order to work.