The story took place in Europe in the days before automobiles _____everyone used horses. [ ]

use water to put out the fire if oil catches fire As is known, oil ________ float on water

Had he spent more time practicing speaking English before, he _______ able to speak it much better now.

Science and technology is changing fast nowadays. I bought this MP3 player at the beginning of this year but now it’s out of ________.

Lucy has got into a situation in her study ________ she finds it hard to go further[ ]