A huge red transport truck stood in front of the little roadside restaurant. The vertical exhaust pipe muttered softly, and an almost invisible haze of steel-blue smoke hovered over its end. It was a new truck, shining red, and in twelve-inch letters on its sides—OKLAHOMA CITY TRANSPORT COMPANY. Its double tires were new, and a brass padlock stood straight out from the hasp on the big black doors. Inside the screened restaurant a radio played, quiet dance music turned low the way it is when no one is listening. A small outlet fan turned silently in its circular hole over the entrance, and flies buzzed excitedly about the doors and windows, butting the screens. Inside, one man, the truck driver, sat on a stool and rested his elbows on the counter and looked over his coffee at the lean and lonely waitress.

Q. Underline the sentence which suggests summer.