Sentence:  At the retarded children′s school, the youngsters occasionally got hamburgers for lunch from a <WSD>drive-in</WSD> chain....he cruised the city looking for <WSD>drive-ins</WSD> where he wasn′t known. 
Meaning of the word marked with <WSD> tags:  A drive-through restaurant where patrons remain in their vehicles and order food and beverages via a speaker phone; the meal is delivered to one's vehicle by a carhop.