(2013·安徽师大附中高三七模)Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.

―Do you know where David is? I couldn’t find him anywhere.―Well. He ______ have gone far — his coat’s still here.

You may get lost easily in big cities like Beijing        you have a map or a guide.

The funny story makes  us ________ a lot.

— The Queshi greenway has become a popular place for Shantou people on the weekends. — That’s right. And you ________ drive your car on it because it is a path for cycling and walking.