单项选择题 His wife is a（n）（）housekeeper.

单项选择题 The fields were（）every year by the run-off water from the mountains.

单项选择题 The picture（）the seriousness of pollution on our planet.

单项选择题 The heat in the（）air rising from the kitchen and bathroom is recovered by the pumps.

单项选择题 More （）intelligence companies will start to emerge to meet this challenge.