1. strength 
A. northern B. wealth   C. smooth           D. breathe
2. lecture     
A. physics          B. medicine         C. accept              D. official
3. single  
A. advantage        B. spoon            C. dangerous           D. handkerchief
4. lead   
A. break            B. peace            C. great               D. breakfast
5. complete
A. cover            B. continent        C. contain         D. conversation